Re: [Gimp-developer] Documentation on color spaces

[Jorge Tijerina <jorgetijerina03 gmail com>]

Reading through this thread, could this mean that we can see CMYK in GIMP
soon? (natively)


On 9 October 2013 23:00, Simon Budig <simon budig de> wrote:

> Elle Stone (l elle stone gmail com) wrote:
> > In the meantime, if anyone would like to read it and give feedback,
> > corrections, suggestions, I'll edit the Guide to make it more clear,
> > more useful, etc (if nobody is interested, that's OK too!).
>
> I think it is very helpful. I've been dabbeling with colors some time
> ago (trying to improve the color reproduction of a network camera) but
> did not dive into the "profiling" area.
>
> Some remarks:
>
> In section B3 I had trouble following, because having five XYZ
> coordinates to specify a RGB cube (with - as you claim - additive light)
> seems over-determined. It is not clear how RGB(1,1,1) - i.e. additive
> RGB(1,0,0) + RGB(0,1,0) + RGB(0,0,1) results in the specified white
> point. The same problem is there with the black point. *if* this stuff
> is additive, then black always will be the absence of R, G, B, i.e. a
> pitch black XYZ(0,0,0). So there is a dragon lurking when claiming
> additivety.
>
> Another (slightly philosophical) issue for me is, that you never explain
> what you mean by color. You write that "every real color (that is, every
> color out there in the world, that humans can see) has a unique
> location".
>
> It might be worth noting, that this is different from looking at color
> as "a specific intensity-distribution of wavelengths". There are
> different intensity-distributions that map to the same XYZ coordinate.
> While a person with normal eye-sight perceives these two
> "intensity-distributions" as the same color (and for these purposes XYZ
> is perfectly OK) a person with a color vision deficiency might be able
> to keep them apart -
>   see e.g. http://en.wikipedia.org/wiki/Colorblindness#cite_note-5
>
> I am not sure if mentioning this helps or if it confuses stuff...  :)
>
> Bye,
>         Simon
>
> --
>               simon budig de              http://simon.budig.de/
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