[argyllcms] Re: Shadow detail problem

  • From: Leonard Evens <len@xxxxxxxxxxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Fri, 01 Feb 2008 12:26:36 -0600

On Fri, 2008-02-01 at 15:53 +0100, Frédéric wrote:
> Le 1/2/2008, "Graeme Gill" <graeme@xxxxxxxxxxxxx> a écrit:
> >One approach might be to use some sort of CMM link time
> >grey axis gamut mapping, such as "black point compensation".
> >(does lcms and Gimp provide this as an option for the
> >screen rendering ?)
> lcms supports this feature, but Gimp does not use it.

How do you find out just what gimp is doing?  There is essentially no
documentation yet about color management, and all the questions I've
posted to gimp forums have produced either no response or one that was
non-responsive, with one exception.  I've made a few attempts to delve
into the code, but I didn't get very far with that.

Is there some documentation/discussion I've missed, or did you just
discover such things by trial and error?
> Note that Scribus does, so you could check with it.
> >Another might be to setup the display profile to gamut map
> >from sRGB using the ICC CLUT gamut mapping mechanism.
> >(Note that shaper/matrix profiles don't support this
> >type of gamut mapping, they only support colorimetric
> >rendering natively). If your source colorspace was
> >sRGB, then you'd have to specify this as the source
> >colorspace when making the profile (Argyll profile -S option),
> >and then select perceptual rendering in your CMM (assuming Gimp
> >has such control over it's display color rendering).
> Yes, you can choose the intent with both Gimp and scribus, for display
> and printing.
> --
>    Frédéric

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