Talk:Two-color projection

This page was proposed for deletion by JoeNMLC (talk · contribs) on 29 September 2025.

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This is not physics

Latest comment: 11 months ago6 comments2 people in discussion

This is essentially an optical illusion tricking the brain into seeing more colors than there is and has nothing to do with either physics or optics. So the current text is not a good one, starting with the title (system?). For comparison, there is well-known illusion when the brain can be trained to see colors (briefly) in a black-and-white picture. So the article needs to be re-written from scratch (the just-added sources seem to be OK). Incidentally, as-is, this color perception quirk is somewhat better documented already in the Perceptual paradox#Statements of Paradox (see "color constancy" there). Unless there are volunteers to rewrite the text, I suggest redirection there as an alternative to deletion. Викидим (talk) 01:42, 30 September 2025 (UTC)Reply

Agreed about the title; perhaps "two-color projection"? It was studied by people in the business of making digital replicas of natural scenes, for film and video. This article is about a process for producing color images which was proposed for real-world applications and not just a [paradox]; the perceptual paradox page doesn't cover this & is not in the best shape.

I would say it is a combination of biophysics (at the retina) and perception (in our visual processing). The studies of color constancy are relevant, but also studies of relative lightness and color perception from a blank slate (where there is no constancy involved). – SJ + 02:37, 30 September 2025 (UTC)Reply

Yes, the books say, "projection". Thank you! Викидим (talk) 02:44, 30 September 2025 (UTC)Reply

Moved! There's a Nature article from 1961 that uses that term as well; added that cite. – SJ + 02:49, 30 September 2025 (UTC)Reply

Also @JoeNMLC: thanks for flagging this, what do you think of the revision? – SJ + 02:50, 30 September 2025 (UTC)Reply

There is another name, Land effect, that is linked to a more detailed description of the situation, including the retinex theory. A merge there (or copying text from there) should be considered, IMHO. Викидим (talk) 02:57, 30 September 2025 (UTC)Reply