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Luminance (L) data is normally used in combination with data captured through red (R), green (G) and blue (B) filters to produce an LRGB image in which the colour is produced by the formation of an RGB image comprising the R, G and B 'channels' but the detail is provided by a painstakingly processed L channel.

Luminance in the context of astro-photography is the collection of all the wavelengths of light that your telescope and camera combination can accept. Images are normally (but not exclusively) captured using a 'Luminance' filter which normally has an Infra Red (IR) cut feature as IR is not required for amateur imaging.

Luminance in the context of astro-photography is the collection of all the wavelengths of light that your telescope and camera combination can accept. Images are normally (but not exclusively) captured using a 'Luminance' filter which normally has an Infra Red (IR) cut feature as IR is not required for amateur imaging.

Oled v lcdvs qled

There are various considerations to make when buying a new TV. One of the most important decisions is the type of screen technology – OLED vs LED?

I'm a great believer in luminance. I recently conceded that my friend Tom O'DOnoghue was right to go for L, even on a starfield shot.

Buying a new TV? OLED and LED are the main screen technologies. But before we get into the details, you may be asking yourself - what is the difference between OLED and LED? Here, we explain the key differences between them to help you decide which is best for you.

I see, so in principle there are no "standard" coefficients to transform three dimensional (RGB) to one dimensional data?. Is it largely a subjective matter?

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LCDvsOLEDSteam Deck

I see, so in principle there are no "standard" coefficients to transform three dimensional (RGB) to one dimensional data?. Is it largely a subjective matter?

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Of course this is a VERY subjective process as two people may choose to tweak even a synthetic luminance layer to bring out different features.

LCDvsOLEDphone

I tend to think of Luminance as being a fluid collection of data with no specific standards - you don't even need a specific Luminance filter to capture the data as an IR filter or a good quality LP filter like a Hutech IDAS LP filter can be used to capture the raw data. I think it wise to include IR cut in the channel but that's the only constraint that I'd put on it. The processing of the Luminance channel is very much dependent of subject, sky conditions and personal taste!

No, for a galaxy starfield I'd still go for an RGB-only approach. The interest is in the galaxy and small field stars really help to put the eye's attention there. However, Tom and I recently did a 'stars only' image of M22 (globular) in a rich MW starfield and, when the interest is only on the stars, I had to concede that the L layer brought more 'pop.'

LED refers to light-emitting diodes, which are the bulbs behind the TV screen that form the backlight. There are two types of backlight – including edge lit, and direct lit. The tiny LED lights that make up the backlight are used to illuminate the pixels to deliver crisp, clear picture. When you turn on the TV, these illuminate to light up the pixels, or switch off to block light passing through when a darker picture is required.

Difference betweenOLEDandLCDiPhone

Interesting! I remember you erasing all the luminance data in the star field from a certain M31. Would you do that differently now?

I sometimes find that a my RGB images show better contrast in the green and blue channels than the red one so my 'luminance' layer can look decidedly horrible.

OLEDvsLCDlifespan

OLED is a completely different type of screen technology – widely regarded by TV experts as the pinnacle of picture quality. LG has been a pioneer of OLED for several years, and it has since grown in popularity among other manufacturers.

Interesting! I remember you erasing all the luminance data in the star field from a certain M31. Would you do that differently now?

OLED stands for organic light-emitting diode. It’s a relatively new type of screen technology that does not require a backlight. These self-emitting diodes illuminate every single pixel in the screen by generating their own light. This delivers superb picture quality using less energy.

Now you may be wondering, why choose an OLED TV? Is an OLED TV better than a LED TV? If you want the best picture quality, it has to be OLED. Hollywood filmmakers like Tim Miller have praised its ability to deliver ‘the best images’ in ‘the best possible conditions’.

I tend to think of Luminance as being a fluid collection of data with no specific standards - you don't even need a specific Luminance filter to capture the data as an IR filter or a good quality LP filter like a Hutech IDAS LP filter can be used to capture the raw data. I think it wise to include IR cut in the channel but that's the only constraint that I'd put on it. The processing of the Luminance channel is very much dependent of subject, sky conditions and personal taste!

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I was persuaded early on about the benefits for splitting my RGB images into two, processing one for the best colour, perhaps using slight blurs to help colour up over-exposed patches and another 'synthetic luminance' layer processed to give the best detail and contrast with acceptable noise levels, without worrying about the colour balance, this is then used as a luminance layer on top of the RGB layer.

Previously, OLED has been deemed the superior screen technology, and you may find yourself asking is OLED better than LED? Developments in recent years have challenged this notion and have narrowed the gap for LED TVs. These technologies include:

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No, for a galaxy starfield I'd still go for an RGB-only approach. The interest is in the galaxy and small field stars really help to put the eye's attention there. However, Tom and I recently did a 'stars only' image of M22 (globular) in a rich MW starfield and, when the interest is only on the stars, I had to concede that the L layer brought more 'pop.'

Subjective for me, too. Luminance is, for me, the spectrum which goes from blue, through green, to red. (I use a Baader L filter.) What does it add to RGB? Speed. In theory an hour of L ought to be roughly equivalent to an hour of red plus an hour of green plus an hour of blue. In fact an hour of L goes far deeper than that. My experiments suggest that the best you can hope for from 3 hrs RGB is about 75% of an hour of luminance and that is being optimistic. Once you start to process your image this becomes highly significant. You can process harder without breaking through the noise floor. That means you can stretch the faint stuff and sharpen the bright stuff without breaking down into noise.

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Interesting! I remember you erasing all the luminance data in the star field from a certain M31. Would you do that differently now?

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Good explanation, thanks. What is not clear for me is if all luminance calculations in the context of astronomy are done by the same standards, that is, is using the same coefficients in the equation to transform the data. Are you, or anyone else, aware of this?

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OLEDvsLCDpower consumption

OLEDvsLCDwhich is better for eyes

With a better understanding of these two prominent types of screen, hopefully, you can decide between OLED vs LED for your new TV."

While both LED and OLED TVs offer 4K and HD resolution, the main difference is in the way the screens are made and how they create their display.

Most new TVs will have an LED screen. Sometimes referred to as LCD and NanoCell, they are all based on the same screen technology – though NanoCell is vastly superior to standard LED.

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Luminance (L) data is normally used in combination with data captured through red (R), green (G) and blue (B) filters to produce an LRGB image in which the colour is produced by the formation of an RGB image comprising the R, G and B 'channels' but the detail is provided by a painstakingly processed L channel.

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