Re: [Gimp-developer] Attempt to summarize the discussion of my examples of what doesn't work in unbounded sRGB

On 04/21/2014 07:07 AM, Teo Mazars wrote:

Hmm, I understand, then the default black-to-white gradient would be non perceptually linear, which is more 
surprising than the color-to-color gradient. I think I am now convinced this is correct, but it will probably 
be puzzling to use.

BTW, "gradient" is not such a good example because it's not related to chromaticities, "Invert" would be a 
better one.

I don't understand what you are trying to say. How is drawing a gradient from most saturated red to most saturated green in any given color space not related to chromaticities?

The color space chromaticities are what determine the most saturated possible colors in any given color space.

Aren't the negative RGB values required to draw a gradient in unbounded mode sRGB from Rec. 2020 reddest red to Rec. 2020 greenest green exactly what makes the gradient so horribly wrong when drawn in perceptual rather than linear? It's the effect of the perceptual TRC that sends the "out of bounded sRGB gamut" colors to strange places.


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