calibration photometer for lcd monitors supplier

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EIZO’s ColorEdge monitors with built-in calibration sensors are developed and manufactured entirely in-house. See how they achieve the color precision and consistent image display needed for creative fields.

In February 2021, four of EIZO’s lead innovators accepted an Academy Sci-Tech Award (Technical Achievement) for the ColorEdge CG Series monitors with built-in calibration sensors. EIZO was the first manufacturer in the world to bring a self-calibrating color precision solution to market in 2010, and continues to commit itself to providing highly precise and sophisticated imaging solutions made with dedication and care.

In September 2020, the ColorEdge PROMINENCE CG3146 HDR reference monitor was awarded the 2020 Hollywood Professional Association (HPA) Award for Engineering Excellence. As the first true HDR reference monitor in the world to be equipped with a built-in calibration sensor, it was recognized for its advanced technologies that put it at the forefront of innovation in creative visual solutions.

ColorEdge is a line of color management monitors developed specifically for addressing users in photography, film, broadcasting, printing, and other creative fields. For these industries, not only color fidelity, but display characteristics such as brightness, gamma, and uniformity across the screen need to be maintained so the final output content displays as intended in the target environment.

Each ColorEdge monitor undergoes rigorous quality control during production and is individually adjusted in-house using one of the color industry’s highest end, professional spectrophotometers. The human perception of color varies greatly depending on several factors such as ambient lighting, surrounding color, angle of observation, and individual optical variances. Using a high-quality sensor to adjust the monitors to meet certain color standards ensures consistency by minimizing the effect these variables have in the measurement results. EIZO’s factory uses sophisticated machinery in its production line to automatically carry out calibration for each monitor in a controlled environment. The sensor is placed directly over the monitor and red (R), green (G), and blue (B) gamma values are measured from 0 – 255. Then the monitor’s 16- or 24-bit LUT (look-up-table) is used to select the 256 most appropriate tones from trillions of perceivable colors to achieve the smoothest color gradations. This results in an image without deviated steps.

LCD monitors commonly exhibit fluctuations in brightness and chromaticity across the screen, which affects color precision. To counter this, EIZO also measures and adjust multiple points on each monitor to achieve stable brightness and chromaticity across the entire screen and correct deviations using its patented digital uniformity equalizer (DUE) technology. DUE controls the tone values pixel-by-pixel across the monitor for evenly distributed luminance.

Are you looking for the highest level of on-screen color accuracy for all of your screens, including projectors? Then the i1Display Pro is the solution for you! It’s two user modes, Basic and Advanced, provide serious Color Perfectionists with the perfect combination of unrivaled color precision, speed, options and controls to fit any workflow. You’ll no longer risk spending hours at your monitor perfecting images or video only to find that the display was not accurately representing the digital files. Properly profiling and calibrating your displays ensures reduced editing time and a more realistic no-surprises representation of final output.

Top-of-the-line i1Profiler color management software offers the ultimate in flexibility and control. Basic mode offers a wizard driven interface with predefined options for the quickest path to professional on-screen color. Advanced mode offers user-defined options for more sophisticated profiling workflows to deliver the highest quality color results on monitors and projectors, as well as display testing and quality assurance tools.

Compensates for the ambient light surrounding your workspace with Ambient Light Smart Control. Since the intensity or amount of ambient light in your workspace affects the way you perceive color on your display, take advantage of i1Display Pro to automatically adjust your profile or simply notify you as ambient light conditions change. With the integrated Ambient Light Measurement, i1Display Pro automatically determines the optimum display luminance for comparing prints to your display.

Flare Correct™measures and adjusts your display profile for reduced contrast ratios caused by flare light (or glare) falling on the surface of the display. By accurately measuring your effective display contrast ratio, you’ll have an even more accurate display profile.

Intelligent Iterative Profiling,an adaptive technology,produces optimized results for maximum color accuracy on each unique display every time you profile.

Next generation i1Profiler software for calibrating and profiling all modern display and projector technologies including LED & Wide Gamut LCDs. Advanced user-defined controls support more sophisticated workflows.

Save time by re-using profile settings on multiple displays connected to the same computer or multiple computers within a workgroup. In addition, Automatic Display Control (ADC) adjusts display hardware for increased speed and fewer manual adjustments.

The included i1Profiler color management software offers the ultimate in flexibility and control. Its Basic mode offers a wizard driven interface with predefined options for the quickest path to professional on-screen color. The Advanced mode offers user-defined options for more sophisticated profiling workflows to deliver the highest quality color results on monitors and projectors, as well as display testing and quality assurance tools.  i1Display Pro profiling provides full support for NTSC, ITU-R-Rec.BT.709 and PAL SECAM broadcast video standards.

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In SpectraView, de-select the "Calibration On" checkbox. You can also check your user manual for directions to unlock the controls without using SpectraView.

The SVII-KIT has been discontinued as of February 2009 and has been replaced with the SVII-PRO-KIT. All LCD3090W-BK-SV (LCD3090WQXi SpectraView bundle), LCD2490W2-BK-SV (LCD2490WUXi2 SpectraView bundle), LCD2690W2-BK-SV (LCD2690WUXi2 SpectraView bundle), P221W-BK-SV (P221W SpectraView bundle) include the new SVII-PRO-KIT with the new MDSVSENSOR2. Other bundle models created before February 2009 may include the SVII-KIT, but all bundle models created after this date include the new SVII-PRO-KIT.

The -SV series are the bundles of a display monitor with the SVII-PRO-KIT (color sensor and SpectraViewII software). The naming consists of the monitor model name (LCD2690W2 is an LCD2690WUXi2), followed by "-BK" to indicate the color is black (for models available in colors other than black). Lastly the "-SV" indicates it is the SpectraViewII series bundle.

Yes. Free updates are available for download for customers who have purchased SpectraView. The license key from your original purchase will be required to install and use the software.

Unfortunately no. Before purchasing please be sure to carefully check the latest compatibility information for your system in the README file for the latest version of SpectraView.

For detailed questions regarding SpectraView please use the online feedback form. Support is also available for SpectraView and all other issues by contacting NEC.

The number of letters visible will depend on the calibration settings and viewing environment. In some cases it may be very difficult to make out the "...NTROL", especially with high levels of ambient light.

See the User"s Guide and README file included with the software and on the NEC website for further information about any specific incompatibilities or issues.

2) Confirm that your model of display monitor is supported by SpectraView. See the README file included with the latest version for a complete list of supported models.

Why are the Spyder color sensors not recommended for use with wide color gamut displays such as the LCD2690WUXi, LCD2690WUXi2, LCD3090WQXi, P221W, PA241W, PA271W and PA301W models?

Our evaluation of these devices has determined that the accuracy of measurements when used with wide color gamut displays could lead to large color errors. Therefore we do not recommend using this device on wide color gamut displays.

Spectraview software is specifically designed to work hand in hand with NEC Displays. The software works seamlessly with a compatible display and supported calibrator for color-critical applications, such as photography, video editing, animation and medical imaging. Using our software will ensure you"re getting the most out of your display.

No. The hoods for many models are available as a separate option in the accessories section, or can be purchased from online retailers who sell NEC Professional displays. The part number for the hoods are listed on the corresponding display product page.

Yes. Starting with SpectraView version 1.1.00 all Target files are cross platform between Mac, Windows, and Linux. This means it"s possible to send Target files to other users on different machines.

If you are using analog (VGa or DVI-a) video then this is not recommended because there can be variances between the analog video signal levels on different machines that can impact the calibration.

When used with the SpectraView software, NEC display monitors store all of the necessary color adjustments internally, including the 10- or 12-bit Look Up Tables. The ColorSync utility switches the display color settings by changing the Look Up Tables in the video graphics adapter. The ColorSync profiles generated by SpectraView contain linear Look Up Tables for the video graphics adapter. Because of this, SpectraView must be used to update the display monitor.

No. SpectraView will automatically regenerate the correct ICC/ColorSync profile for the current calibrated Target settings and install it on your system.

No. SpectraView is targeted specifically at providing the best possible color performance and calibration with the supported NEC displays using hardware calibration. Other displays can be profiled but not calibrated in SpectraView.

For Delta-E values of less than 2 there is almost certainly no need to recalibrate. For values higher than 3 it is important to understand what the cause is and whether it"s significant.

The calibration and adjustment process has inherent variability due to many factors such as the repeatability of color sensor measurements, and changes within the display as it is adjusted. The basic accuracy and repeatability specifications for most sensors are +/- 0.002 or higher for CIE xy, and +/- 2% for luminance. These variances alone can give rise to Delta-E values of up to 2 or 3.

When a specific Intensity value is being used for the calibration, the Delta-E value is comprised of the luminance and color differences. Differences in color are much more critical than a difference in relative luminance. Look at the results of the calibration shown in the Information window to determine if the high Delta-E value is caused mainly by a shift in color or in luminance.

High Delta-E values can also occur if a specific Intensity value is being used for the calibration and the display is not capable of achieving the specified Intensity value. The calibration will always aim to achieve the specified White Point, even if the Intensity value could not be reached. If the display can not be calibrated to achieve the specified Intensity value modify the value accordingly.

In some situations, the display Intensity will drift slightly for several minutes after it is adjusted. Since the measured value used to calculate the final Delta-E result is taken up to one or two minutes after the display was adjusted, a higher Delta-E value may be shown, even though the calibration process achieved the specified Target values during the calibration process. Selecting the Extended luminance stabilization time option in the Preferences can be used to try and minimize this effect.

The Delta-E result values shown in SpectraView are higher than those shown in other display calibration applications. Does that mean they are better at calibrating the display than SpectraView?

No. SpectraView calculates the Delta-E values using both the luminance and color differences for more realistic and accurate values. Other applications may calculate Delta-E differently.

After calibration I manually adjusted some of the monitor controls to get a better color match for my particular application. What happens the next time I calibrate the monitor?

The manual adjustments will be reset by the calibration process. We recommend that you avoid manually adjusting the monitor after calibration for this reason.

If you feel it is necessary to tweak the display after calibration, create a new Target file based from the measurements of the display after it has been manually adjusted. Then the monitor will be automatically calibrated to that particular set of characteristics the next time it"s calibrated. Use the Custom White Point tool to measure and set the white point and Intensity values.

These graphs will only show data when the monitor is calibrated to a Target that uses the DICOM response curve. DICOM is normally only used for medical imaging applications.

SpectraView will automatically install the device drivers for the iOne Display color sensor. However it is assumed that if you are using a third-party sensor, then the software that came with it will have already installed the drivers for the device. If you did not install the third-party software then the device drivers will need to be manually installed.

Drivers for all sensors are available on the SpectraViewII CD-ROM or in the \Program Files\Sharp NEC Display Solutions\SpectraViewII\Drivers folder after installing SpectraView (on 64 bit versions of Windows the folder location is \Program Files (x86)\Sharp NEC Display Solutions\SpectraViewII\Drivers).

Yes. The "in the box" video drivers included with Windows 7 do not contain the necessary support for communicating with the display monitor that SpectraView relies on. If you receive a "No communications" error, obtain and install the full drivers directly from the video graphics adapter vendor.

Unfortunately in some cases it may not be possible to calibrate the display directly using SpectraView due to compatibility issues with certain versions of Mac OS or Mac hardware. Such issues are normally out of our control, but we are always working closely with apple to resolve these kinds of issues as soon as possible. In the interim time, the following solutions may be considered:

1) If possible, calibrate the display on another Mac or PC that is supported. Since the display is hardware calibrated it can be moved to another machine and the calibration will remain valid. Be sure to also copy and associate the ColorSync profile of the display.

4) Calibrate using a non-hardware based 3rd party calibration package. Such software may have been included with your color sensor or available from the manufacturer"s website.

I would like to share the calibration results and graphs in SpectraView. Is there an easy way to access this information or make screenshots of the graphs?

Yes. In the "Information" window, right click within any of the tabs and select "Copy." This will either copy the graph as an image, or calibration information as text, into the clipboard. This can then be pasted into other applications.

In general a spectrophotometer provides more accurate color measurements than a "generic" colorimeter does when measuring most displays. However a colorimeter can be specifically calibrated against a lab grade instrument to match a particular type of display, and thus provide extremely accurate color measurements. This approach was taken with the new custom-calibrated X-Rite iOne Display V2 included in the Display Calibration Bundle.

A spectrophotometer can suffer from drift and low luminance noise issues that can cause problems—specifically when measuring and calibrating near black. In general colorimeters provide superior low luminance measurements than spectrophotometer.

The LCD panels used in the SpectraView displays have excellent color linearity characteristics and can be characterized using the much simpler shaper/matrix profiles. accurate 3D LUT profiles require a minimum of around one hundred measurements (and up to several hundred) to generate the necessary data and offer very little advantage despite the large increase in measurement time. additionally there are some compatibility issues with various software applications when using 3D LUT type display profiles.

At this time SpectraViewII is only available for purchase within the US and Canada. In Europe please contact your regional NEC sales office for information on what calibration options are available. In Japan SpectraViewII is sold under the SpectraNavi name.

Yes. The SpectraViewII calibration system is developed by NEC and optionally includes an NEC branded X-Rite iOne Display V2 color sensor. SpectraViewII can be used with any supported display model and is sold both as a complete kit bundled with a display, and as an add-on product.

In Europe SpectraView Profiler includes a display monitor with hood, custom calibration software developed by basICColor, and each display is individually certified. It is not possible to purchase and use the SpectraView Profiler software with a non-SpectraView Profiler display.

The new SVII-PRO-KIT includes the MDSVSENSOR2, an NEC branded X-Rite iOne Display V2 color sensor that is custom calibrated for increased measurement accuracy with our wide color gamut displays such as the LCD2690WUXi, LCD2690WUXi2, LCD3090WQXi, and P221W. It is backward-compatible with standard color gamut displays. The SVII-KIT included an NEC branded X-Rite iOne Display V2 but did not have any custom calibration.

I have two supported NEC display monitors that I would like to use in a dual monitor configuration on one machine. Do I need to buy two SpectraView licenses?

Yes, but it is currently limited to customers with large installations of NEC display monitors. To learn more, please submit a request using the online feedback form.

The most advanced, innovative and user friendly digital aerosol photometer available today, the 2i Digital Photometer is portable, yet rugged, and the ideal instrument for in-situ filtration system integrity testing. The iProbe, a handheld scanner with local LCD display and controls, enables the operator to change settings without stopping to adjust the base unit, minimizing downtime.

The 2i base instrument’s 4.3 in. LCD gives life to the easy to use, menu driven interface. Aerosol measurements and pump sampling rates are prominently displayed for easy viewing. System parameters and selections such as alarm types, alarm set points and aerosol reagent are shown on the lower menu bar, while icons at the top of the screen give the status of connected peripherals, reporting functions, and aerosol noise suppression selections.

Annual NIST traceable calibration service is provided by ATI or an ATI-certified calibration facility. Calibration includes setting the aerosol reagent references, sample flow reference points, operating voltages, and servicing the light scattering chamber assembly. Routine preventative maintenance entails cleaning and inspection of internal sample tubing and connections, the internal reference filter, and iProbe.

Designed for the rigors of nuclear and other hazardous applications, the 2i-N (the nuclear version of the 2i) is equipped with a unique, sealed sample train. The unit is engineered to allow safe removal and replacement of contaminated sampling components.

Upstream aerosol mass concentrations are displayed in actual mass concentration values of micrograms per liter (μg/l). User settable Aerosol Noise Suppression (ANS) allows for more stable aerosol.

Manufacturer of combustion efficiency, opacity, dust and particulate monitors. Portable monitors are available for periodic measurement of sulphuric acid dew point temperature. Flue gas oxygen monitors are offered in 0 to 50 degrees C operating temperature, 110 or 230 VAC voltage, 50 to 60 Hz frequency and 10 VA current and used for combustion analysis or pollution control applications. Features of some monitors include data logging, built-in printers, store readings for later analysis, corrosion resistant, Modbus communications, 4-key user interface controls, IP65 environmental protections, weatherproof and dual sensor technology. Some monitors are used for continuous emission monitoring purposes. Suitable for boilers, heaters and furnaces. Serves the mineral, hydrocarbon processing, power generation and steel industries.

Leading the industry in real-time dust monitoring, the DustTrak™ DRX Aerosol Monitor 8533 can simultaneously measure both mass and size fraction. The DustTrak DRX desktop monitor is a multi-channel, battery-operated, data-logging, light-scattering laser photometer that gives you real-time aerosol mass readings and collects a gravimetric sample. It uses a sheath air system that isolates the aerosol in the optics chamber to keep the optics clean for improved reliability and low maintenance.

It is suitable for clean office settings as well as harsh industrial workplaces, construction and environmental sites, and other outdoor applications. The DustTrak DRX monitor measures aerosol contaminants such as dust, smoke, fumes and mists.

provides a true 14 bit monochromatic output. Note that the Bits++ device is now deprecated and has been replaced by the Bits# device. For more information, see the Video Outputs section of the chapter Supported External Devices.

horizontal resolution. Note that the Bits++ device is now deprecated and has been replaced by the Bits# device. For more information, see the Video Outputs section of the chapter Supported External Devices.

This mode provides a quasi-continuous resolution for luminance and color outputs by using a stochastic dithering technique (Allard & Faubert 2008) without losing much spatial resolution.

DICOM calibration of medical displays requires a high-precision, front-of-screen photometer that is attached to the display face and is internally baffled to exclude extraneous light sources. Why front-of-screen sensors? Because they will measure luminance where the images are being viewed, and not just the output of the display’s backlight.

This kind of photometer will precisely measure and record the luminance of the display and enable adjustments in real time. The most accurate measurements are achieved with fixed photometers. They provide accurate and traceable measurements of the complete DICOM curve twice per second and over the full lifetime of the display.

2.3. It is our particular concern that we protect and safely store all your personal data entrusted to us. This document provides more information on how we use and process personal data.

3.1. The personal data collected by Sigrist-Photometer AG are needed for the purposes of customer service and promotion. In addition, we analyse the usage patterns of visitors browsing the website for the purpose of personalisation and demand specific preparation of information. The data are collected, stored, processed and used for these purposes.

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3.3. Sigrist-Photometer AG processes your personal data, as far as necessary, for the duration of the entire business relationship (from initiation, handling until expiration of a contract) and, exceeding that, in accordance with the legal safekeeping and documentation obligations accruing from Swiss laws and until a possible legal dispute is ended, continual warranty and guarantee periods expire.

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Google will use this information on behalf of the website operator for the purpose of evaluating your use of the website, compiling reports on website activities for website operators and providing other services relating to website activity and internet usage. Our legitimate interest in the processing of data lies in these purposes. The use of Google Analytics is governed by § 15 (3) TMG or Art. 6 (1) (f) GDPR.

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Sigrist-Photometer AG, Hofurlistrasse 1, 6373 Ennetbürgen, Switzerland (hereafter referred to as »Sigrist« or »we«) offer visitors browsing the Sigrist-Photometer AG website (www.sigrist.com, hereinafter referred to as »website«) a free subscription of the Sigrist newsletter (hereinafter referred to as »newsletter«).

In the following we provide information on the processing of personal data within the newsletter subscription in accordance with Art. 13 and Art. 14 of the General Data Protection Regulation (»GDPR«).

Date and time of confirmation of application (registration and confirmation) in double-opt-in process as well as the IP address of the terminal device used for confirmation, date and time of a possible deregistration of the newsletter

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For determining the language and county-specific content of the newsletter, we use the language, the country and the country-specific version used for registration on the Sigrist-Photometer website.

Analysis of the user behaviour of newsletter subscribers in our newsletter and on our website as well as the preparation of user profiles while using pseudonyms as well as subscriber segments based thereon for the purpose of personalization and needs oriented design of the newsletter.

Newsletter service provider (simultaneously hosting service provider); for sending our newsletter, we assign a processor. They have committed themselves to us to comply with the valid data protection provisions. A processing contract in accordance with Art. 28 GDPR was concluded. More detailed information concerning the processors can be requested at [email protected].

We comply with the principles of data avoidance and data economy. Thus, we will only store your personal data for such a period as is necessary for fulfilling the purposes mentioned here (see Chapter D) or as is required by the various statutory storage periods. After the respective purpose ceases to apply or after those storage periods expire, the corresponding data shall be locked or deleted routinely and in accordance with the statutory provisions.

If personal data are processed for direct marketing purposes (see Chapter D), you shall have the right to object at any time to processing of personal data concerning you her for such marketing.

X-Cal Web allows for both complete front DICOM calibration and QA of DBI LCDs as well as the ability to track and manage calibrations for non-DBI LCDs. DICOM Calibration and Conformance MUST be done from the front of the LCD. This either requires a photometer for manual calibrations or built in Front sensors. DBI LCDs are equipped with 4 built in sensors for complete DICOM Calibration and conformance. (2) Sensors in the retractable front sensor or fixed sensor in the 5MP/10MP (1) Ambient light front sensor (1) backlight sensor X-Cal consists of two components, a local agent package and a network administrative package that is now easily accessible via the web. Paired together with DBI displays, this software and hardware combination allows: - Remote calibration of each display to the DICOM gray scale display function (GSDF) - Easy monitoring of each display from a remote central location - Automatic Email notifications sent when service is required - Total control of display settings, adjustments and launching of calibrations/conformance remotely Other functions X-Cal offers include: - Ability to track calibrations, hours and receive reminder alerts for non-DBI LCDs - Scheduling of automatic calibration and conformance tests - Immediate access to both table formatted and graphical results - Automatic receipt of TG-18 visual tests for MQSA Compliance - Allows for compensation of ambient light, luminance and other workstation settings - The user may view and save historical data on white level, black level, calibration and conformance test for JCAHO/MQSA and other medical certifications - Workstation system performance information PACS Displays Clinical Displays Surgical Displays

It is critical that radiology displays present accurate and consistent images. Double Black Imaging provides calibration software solutions to ensure DICOM Part 3.14 compliance when using our display solutions or non-DBI displays.

Calibration and conformance to the DICOM 3.14 gray scale display function is key when ensuring images are consistently presented and perceptually linearized for diagnostic confidence.

Double Black Imaging (DBI) is the largest supplier of medical displays and calibration software developer who create 100% of our software and perform 100% display system integration in the USA.  Our innovative solutions are designed to reduce healthcare costs by making imaging more efficient and providing the latest in advanced medical imaging technology.

When used with the X-CAL Client with Photometer Kit, your Quality Assurance team has access to all medical displays using the DBI platform, making sure your practice is meeting DICOM 3.14 calibration standards. This includes images with gray levels that are clearly discernible to avoid loss of diagnostic information.

Double Black Imaging knows that a crucial part of medical imaging is traceability. That’s why Quality Assurance record keeping is the foundation for our hardware and software offerings.  With DBI, your imaging needs are complete with a full line of LCDs, calibration software, and enterprise-level, web accessible management of DBI and non-DBI monitors.

The photometer has a large measuring range of 0 … 400 lux. The illuminance is measured using an external silicon photodiode with a spectral filter. This means that the light meter can be positioned appropriately for every measuring task. The measured values ​​can be displayed by the light meter in lux and in footcandles. In addition to the normal measured value display on the light meter, the measured value is also displayed on a scale.

The photometer has additional functions so that an analysis of the illuminance can be carried out. With the additional functions of the light meter, the largest and smallest measured value can be output using the "MIN" and "MAX" buttons. In addition, the displayed measured value can be set in relation to a reference using the "REL" button. With the "PEAK" function, the light meter records peak values. The light meter has a sampling rate of 10 µs.

The photometer also has a data memory of 32,000 measured values. The measured values ​​from the light meter can be read out and analyzed on the PC after a measurement. A live measurement on the PC with the light meter is also possible. The data from the light meter can be exported in CSV format for further processing.

The built-in 3.7V Li-Ion battery can be recharged from the photometer via a 5V DC connection via the micro-USB interface. Due to its measuring range and its various functions, the light meter is used to control the lighting in greenhouses, at the workplace in production workshops or in photo studios, for example. The light meter is equipped with an ISO calibration certificate.

Environics® Ambient Monitor Calibrator with Ozone Generators and optional Photometers facilitate dynamic calibration of ambient air analyzers. All ozone generators are factory calibrated using a NIST and EPA traceable SRP. Units meet or exceed U.S. Environmental Protection Agency requirements.

The S6100 and S6103 automatically perform zero, precision, span and multi-point calibrations using NO, NO2, SO2, CO, O3, hydrocarbons and other gases of interest.

The S6103, 6123 and 6113 all include an internal photometer which measures the actual amount of ozone generated, and corrects for errors, using closed-loop PID control. In the S6103 and S6113, the photometer can also measure external ozone sources.

Both in service and new Series 6100 and 9100 can be optimized for low levels of ozone, down to 5 ppb for the S9100 and 2 ppb for the S6100 repeatably to meet 40 CFR Part 58, Appendix A requirements at NCORE and trace sites!  To learn more contact us!

Calibration is a subject which comes up frequently wherever there is discussion of monitors. As you will hopefully realise from our reviews, there are two important things to consider when purchasing a new screen, and when you might be concerned about it’s ability to render colours accurately: 1) How does the screen perform at default colour settings?, and 2) how can it perform with correct calibration? There are several methods to calibrating your screen which we will discuss below in this article. However, it should be understood first of all that to get truly calibrated settings, and good colour accuracy, you are likely going to need to invest in a hardware calibration solution. This is why we discuss a monitors performance at default settings in our reviews and how the screen is preset in the factory before being shipped. Most users will not have access to hardware colorimeter/spectrophotometer devices, and they are generally not cheap. It’s important therefore to understand what kind of performance you can expect from your screen with basic software configuration.

Panel technology does come into play to a degree when we discuss colour accuracy. There are some common misconceptions however which need correcting. Just because a screen is based on a particular panel technology, does not automatically make it the best for colour accuracy. It is often thought that an IPS panel will offer much better colour accuracy than a TN Film panel, but this is not necessarily a hard and fast rule. Things which do come into play though include:

Viewing angles. For professional colour enthusiast displays, IPS is the most popular choice by manufacturers. This is because the technology offers very wide viewing angles, more so than TN Film and VA matrices. It also doesn’t suffer from the off-centre contrast shift anomaly which you can see on VA panels when moving away from a central field of view. It is also free of the pretty severe vertical contrast shifts you will see from TN Film panels.

Colour Depth – For the best colour reproduction you probably need a panel capable of a full 8-bit colour depth, or perhaps a modern 10-bit panel. An 8-bit module offers a true 16.7 million colour palette without the need for FRC technologies used in 6-bit panels. IPS and VA panels typically offer this, whereas TN Film panels do not. Modern 10-bit panels are becoming more widely used, and most use FRC to increase the colour depth from 8-bit (8-bit +FRC) giving rise to a colour depth of 1.07 billion colours. There are very few ‘true’ 10-bit modules available but there are some out there, usually at a very high cost. Some models offer further enhancements such as a extended internal Look Up Tables (LUT’s) where an even wider colour palette is available to choose from. These can help improve gradients and colour rendering capabilities and are often used in higher end professional grade monitors.

Colour Accuracy Potential. It is true that IPS panels are capable typically of very good colour accuracy, but often you will need to carry out proper calibration with a hardware calibration device to get anywhere near this. However, VA and TN Film panels are certainly capable nowadays of reaching excellent colour accuracy if calibrated correctly. If you look through our reviews, you will see some TN Film panels perform very admirably here, despite the assumption that it is an inferior technology by many people. You will also spot that default colour accuracy really does vary from one model to another, and so you may even find some screens with better default colour accuracy with a TN Film panel, than you see at default for an IPS panel (e.g Acer AL2216W vs NEC 20WGX2). All technologies can offer decent colour accuracy once calibrated, it is the other factors discussed above which normally lead people to chooce IPS if they are doing any colour critical work.

Gamma– This describes the non-linear relationship between the pixel levels in your computer and the luminance of your monitor. Gamma affects middle tones; it has no effect on black or white. If gamma is set too high, middle tones appear too dark. Conversely, if it’s set too low, middle tones appear too light. We aim for a gamma level of 2.2 which is the default for computer monitors and is the standard for the Windows operating system and the Internet-standard sRGB color space. The farther you drag the video system from this optimal level, the more calibration artefacts such as shadow banding and posterization appear. Therefore, a gamma of 2.2 allows for the maximum range of colors your system can display.

Luminance – We aim for a luminance (often referred to as brightness as well) of 120 cd/m2, which is the recommended luminance for LCD displays in normal lighting conditions.

Colour Gamut – Represented by the CIE diagram (on the left of the report), this can’t be calibrated as such, it more gives an indication of how much of the human eye’s colour space the screen can cover in its reproducible shades. The larger the monitors gamut (represented by the triangle), the better really.

Black Depth – is the monitor luminance or print reflectance for value = pixel level = 0; i.e. it is the deepest black in the monitor. The lower the value recorded, the better. We aim for 0.0 cd/m2 (truly black), but in practice it doesn’t reach this low on modern LCD screens.

DeltaE / Colour Accuracy – We aim for the best colour accuracy possible, where the colour displayed by the monitor is as close as possible to the colour requested by the graphics card. On our DeltaE graphs (as shown above), the lower the bars are down the graph’s Y-axis, the better in terms of colour accuracy. For reference, LaCie describe the DeltaE readings as:

These are the settings we aim for when calibrating a monitor in our tests, and is what your calibration process should work towards, regardless of whether you are using software or hardware methods.

Software calibration methods can be handy in helping to adjust some basic settings on your screen. They are most useful in helping to get the screen operating at a comfortable setting, helping to get a decent contrast / brightness level, and a good colour balance. This is a good way to help improve the ‘feel’ and look of the screen, but it should be noted that it does not necessarily result in more accurate colour rendering from a strict point of view. Settings are normally altered either manually through the OSD options (RGB levels, contrast and brightness) or through similar controls at the graphics card level.

Commonly LCD monitors come set with a default 100% brightness which means that luminance is way above the desired 120 cd/m2 we aim for. This is frequently the main issue with LCD monitors, and is something which can be corrected to a comfortable level at least using software methods. Contrast can also be improved to a degree, and colour levels can be evened and at least appear to be at a nice setting. All these methods rely on the human eye, and so the individual preferences and ambient lighting conditions come into consideration here.

The first calibration utility is a simple gray scale consisting of 17 steps between white (255) and black (0). Adjust your monitor’s brightness and contrast controls so that the full range of the scale is visible. The darkest step visible (Step 16) should be just barely visible against the black background surrounding the scale.

The second calibration utility gives a bit more control. You should be able to adjust the monitor controls and, if possible, the system gamma from your GFX card settings, to be able to detect the small squares within all of the larger squares of the array.

Adjust your monitor’s colour levels. If your monitor is properly calibrated you will see distinct steps between all 21 steps of each color strip and the steps will be uniform in appearance.

Adjust your monitor’s colour levels again. If your monitor is properly calibrated you will see distinct steps between most of the 21 steps of each color strip and the steps will be uniform in appearance. Most monitors do not display the lightest end of the scale accurately so the last 2-3 lightest steps may look the same.

There is a very useful website here (http://www.lagom.nl/lcd-test/) which gives you various tests and methods for calibrating your screen. Well worth a look for some free “by eye” calibration.

There are many different software tools available, and in fact many manufacturers like to package their own software with the screen to allow calibration. For instance, Samsung package some of their screens with Natural Color Pro software which allows the user to calibrate their screen quickly and easily. Further software tools are available which might be worth taking a look at as listed below. There are also various test images available which can be handy for you to test, with the human eye, the colour levels you have arrived at.

Proper calibration of a monitor really requires you to use a hardware calibration device. These come in two varieties, with the more mainstream (and affordable) devices being colorimeters. You can also buy higher end spectrophotometers (such as the X-rite i1 Pro) which read the light differently, but the cost is probably prohibitive for most normal users. There are many different devices to choose from which vary greatly in price, performance and accompanying software packages. These devices are connected to your PC typically via USB, and feature a hardware module which you place over the screen. By running the software suite which comes with the device, the tool sits over a background which displays many different colours. These are then recorded by the device and used to establish how accurate the colours shown on the screen are compared with what is being requested by the graphics card. Once this difference is established, the device can be used to correct the difference as best as possible from the screen, and results in a calibrated profile being produced.

Hardware devices will typically run through the calibration process automatically once you have defined your target settings and been guided through some basic hardware adjustments using the OSD menu (brightness, contrast, RGB values). Apart from these changes, the majority of changes are implemented at a graphics card LUT (Look Up Table) level after that through the creation of the profile. Some higher end screens offer hardware level adjustments to the monitors LUT which can offer an even better level of accuracy. This is normally reserved for high end professional grade monitors.

The accuracy of these calibration devices obviously varies somewhat, and quite often you get what you pay for. Obviously the features and options of the software package come into play as well, and so cheaper devices typically offer limited calibration options and reporting functions, whereas high end devices are far more versatile. For professional grade calibration it is recommended to spend what is a considerable amount of money on a device which is well regarded. Manufacturers like Gretag and LaCie make a series of devices which are widely used on monitor review sites, and their higher end models feature extensive software options and provide detailed analysis and reporting of colour rendering.

If you want high end results, you are probably looking at spending in excess of £150 on a colorimeter, or >£800 if you want a spectrophotometer. The cost will vary depending on the software options taken with the device and anything else which might come in the package. There are of course cheaper options available which have proved popular. These are often more than adequate for most average users, and unless you’re really concerned with top notch accuracy for photo / graphics work, you probably don’t need much more. For example, the Spyder3 or Pantone Huey do a decent enough job of levelling colours and settings for most average users, and retails for around £60 in the UK. See our various reviews for more information about colorimeters, spectrophotometers and calibration software.

Profiles are commonly produced when calibrating a screen. They are preset saved settings for your particular graphics card / monitor combination and can be used to match different devices (e.g a monitor, printer, scanner, camera etc). These help ensure the settings remain consistent across all the devices, so that you don’t see different results on each one. Profiles are simply look-up tables that describe the properties of a color space. They define the most saturated colors available in a color space; i.e. the bluest blue or deepest black your monitor can produce. If you don’t have a profile, the trio of Red, Green, and Blue values (or CMYK) that make up a color have no particular meaning – you can say something is blue, but not exactly which shade of blue. Accurate profiles are the key to a color managed workflow. With accurate monitor and printer profiles, your prints will closely match what you see on your monitor. Without profiles, you need to rely on trial and error combined with guessing.

It should be noted that an ICC profile is produced based on your individual hardware components and set up. As such, it’s not possible to share ICC profiles with other users of the same monitor to achieve the exact same results. However, ICC profiles which are shared can often at least help improve settings and colour accuracy to a certain degree, and so are an easy method of attempting calibration without the need for a colorimeter. It certainly won’t hurt to try them if you can find an ICC profile has produced with a colorimeter and then has been shared by the user for your particular screen.