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Re: ICC on color picker

by Jon Cruz :: Rate this Message:

On Jun 23, 2009, at 6:13 AM, Alexandre Prokoudine wrote:

> On Tue, Jun 23, 2009 at 7:30 AM, Jon A. Cruz wrote:
>
>> When it grabs something else (from another app's window) we could
>> grab it as RGB, or we could possible find a current document stye
>> that contained the same one. The latter would be a more complex piece
>> to get right though.
>
> Hmmmm. Say, I have a bitmap in AdobeRGB which has a much wider gamut
> and I want to pick a color that is out of gamut for sRGB. What would
> Inkscape do in this case?

Simple. What *should* happen is

1) Inkscape has been tracking color spaces of images, and knows that
the one under the cursor has an AdobeRGB profile attached.
2) It grabs the original values at that location (not the adjusted
ones currently used for display)
3) It gets a nice combo of original and adjusted colors.

So if the original values are RGB and the ones adjusted for display
are R'G'B', then the resulting fill would be similar to

fill: RGB icc-color(AdobeRGB, R', G', B')

(with numbers instead of "R", "G" and "B", of course)

Note that by going to the original numbers we avoid re-conversion
rounding error creeping in. With 8-bit components that can become
significant quickly.

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