Intentional Color Corrections Planned for Display in Ambient Light

Started 1 month ago | Discussions thread
Mark Scott Abeln
Mark Scott Abeln Forum Pro • Posts: 15,555
Re: Intentional Color Corrections Planned for Display in Ambient Light

flyinglentris wrote:

I am assuming that this is never done and the offense of the display condition is simply tolerated and accepted.

Am I wrong?

What you want to do will require a lot of careful research.

At the very least, you'll have to investigate the color properties of your printer inks under your given light source. Just because you get a color match under a standard 6500K illuminant doesn't mean that your print will retain the color matching under a weird illuminant. For example, suppose you have a red apple, and the print matches the apple color exactly in sunlight: but there is no guarantee that the red apple and print will match under your illuminant because there's no guarantee that your inks have the same spectral reflectance as your apple. You could use a standard test target, but then the same problem occurs.

This kind of correction is not obvious nor is it straight-forward, but rather you need to do a considerable amount of lab testing with a wide sample of test subjects.

What we do now is easy: match colors as if they are photographed and viewed under bright daylight conditions, along with some ad hoc but not systematic corrections, such as boosting saturation and contrast when making a print. And then we take advantage of, and trust, the eye's own color constancy. I ought to mention that the color constancy problem, especially as it relates to automatic white balance, was one of the very first applications of artificial intelligence, way back in the 1950s!

But you are trying to make a print, viewed under an extreme light source, that will appear to give colors as they would look in daylight. That is very difficult, and perhaps not even fully explored in research. This problem will fall under the research topic of "Color appearance models". Here is the Wikipedia article on the subject:

https://en.wikipedia.org/wiki/Color_appearance_model

And here is a book you might want to study:

https://last.hit.bme.hu/download/firtha/video/Colorimetry/Fairchild_M._Color_appearance_models__2005.pdf

Good luck!

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