On 10/24/20 5:43 AM, marcodv@xxxxxxxxx wrote:
Now, you are right that there's one inconsistency, gimp color picker's xyY is not the same as to what is being pushed to the operation. I've got the same color picker result as you have.
Well, actually everything I said was right :) . Which means the
discrepancies between GIMP's xyY values for sRGB reddest red and what
you got at the command line still needs to be accounted for.
I also reached out on the get issues for gimp and it might have been a known issue: https://gitlab.gnome.org/GNOME/gimp/-/issues/5805
Checking the referenced issue, exactly as I said, there's an assign
where there should be a convert.
To repeat, the discrepancies between GIMP's xyY values for sRGB reddest
red and what you got at the command line still needs to be accounted
for. This is a separate error from the "assign" instead of "convert" issue.
Pippin - do you have any idea what caused the discrepancies in the
reported xyY values for sRGB reddest red? Is it a problem in babl or GEGL?
So if changing the rendering intent does make even a small difference
I tested that again and there's no difference at all between perceptual and relative colorimetric.
That's good!
But I tried converting with saturation and absolute colorimetric and gimp stdouts that those conversions seem to be not implemented.
babl hasn't implemented code for working with LUT profiles. Also matrix
profiles don't have saturation intent tables, just as they don't have
perceptual intent tables. And V4 profile processing always uses relative
colorimetric for conversions between RGB matrix profiles regardless of
any specified intent. Which is why any differences in results (other
than "not supported" messages) from specifying different intents would
have indicated a problem "somewhere".
Elle
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