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Tetrachromacy and how it relates to computer graphics
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NiHaoMike:

--- Quote from: I wanted a rude username on February 26, 2023, 04:59:37 am ---This claim of 6% of the population (0% of men, 12% of women ... it's sex-linked and requires heterozygosity) refers to what I'd call "weak" tetrachromacy, not the experience of the painter profiled in this article. Weak tetrachromats' vision is pretty much like normal trichromats'.
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Is there some other genetic factor that affects if the tetrachromacy is usable? Or do they just haven't learned to recognize the subtle differences in color?

--- Quote from: Tomorokoshi on February 26, 2023, 03:08:32 pm ---Green is a difficult color. Also, most computers and displays are stuck with 8-bits per channel storage and display formats that were declared by consortia of "professionals". Their main purpose was to make something cheap, not something extensible. We are left with an inadequate infrastructure that will be very difficult to move beyond.

10-bits per channel would have started to make the situation a little better, while 12-bits per channel would be close to the limit of perception. To drive 12-bits would require DAC hardware closer to the 14-bit to 16-bit range.

With only 8-bits per channel there isn't enough color-space resolution to cover shadows in the blacks, highlights in the whites, and to avoid banding in the mid-range.

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That's exactly what HDR is supposed to solve.

--- Quote from: CatalinaWOW on February 27, 2023, 12:41:55 am ---A chromaticity diagram really makes understanding of this easier.  There are many colors that simply can't be represented by three phosphors.  Something like half of the color space is not represented by standard phosphors.  LEDs can cover more of the color space but still leave a lot of room.  And because the shape of the boundary of the diagram is a complex truncated archlike shape, adding phosphors (or LEDs) just improves the polygonal approximation.  And given the satisfaction achieved with three for most people it seems really unlikely that we will ever have systems with eight or sixteen monochrome LEDs just to get high 90s coverage of the color space.  But it might be fun as a research project to use an array of the TI Digital Light Valves to build such a display and then test people to evaluate benefit vs completeness of color coverage.

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I have noticed that the colors on OLED and IPS displays are very good.
I wanted a rude username:

--- Quote from: NiHaoMike on February 27, 2023, 03:45:30 am ---Is there some other genetic factor that affects if the tetrachromacy is usable? Or do they just haven't learned to recognize the subtle differences in color?

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It seems to have a genetic basis. For example, in this study of 7 carriers of protanomaly and 24 carriers of deuteranomaly:

> However, one participant cDa29 ... behaves as if she has access to an additional cone signal: she made no errors at any value ... and her response times not only are faster than those of other participants ... but are roughly even across the stimulus space
> Perhaps the most important result of our Rayleigh discrimination test is that most carriers exhibit a region of the Franceschetti space in which their discrimination is impaired in the same way as is found for color-normal controls. Thus, by this test, the great majority of carriers show no sign of tetrachromacy.
> cDa29 is the single exception.

As usual, further research is required.
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