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

On Mon, Apr 21, 2014 at 1:16 PM, Elle Stone
<ellestone ninedegreesbelow com> wrote:
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?

Picking the gradient color stops (including start and end) colors can
be considered as separate from the color space the rendering process
and interpolation is done in.

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.

This might be an argument that do the _interpolation_ by default in
for instance CIE Lab instead of sRGB.


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