[argyllcms] Re: gamut mapping. Excuse me for mistake.
- From: Nikolay Pokhilchenko <nikolay_po@xxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 24 Jul 2009 08:54:52 +0400
Ouch...
I've saw just only want to saw... I've didn't notice "out" in "completely out
of gamut" phrase. So my previous message is completely mistake.
I'm sorry.
-----Original Message-----
From: Nikolay Pokhilchenko <nikolay_po@xxxxxxx>
To: argyllcms@xxxxxxxxxxxxx
Date: Fri, 24 Jul 2009 08:46:52 +0400
Subject: [argyllcms] Re: gamut mapping
> nome cognome wrote:
>
> > I did some tests using AdobeRGB as starting space and sRGB as
> > destination space. My monitor is a wide gamut one, so Adobe RGB is
> > fully contained in its gamut.
> > I used both Relative and Perceptual (with Argyll gamut mapping)
> > intents. The original image contains a gradient completely out of
> > gamut for sRGB, so using Relative intent I should obtain a uniform
> > color, while using Perceptual intent with gamut mapping I should
> > obtain the same (but shifted) gradient.
>
> This is a rather useless test, because the sRGB gamut completely go in the
> AdobeRGB(1998) gamut without any gamut compression. So the mapping algorithm
> acts just as simple relative conversion.
>
> > But there are no differences between Relative and Perceptual intents :(
>
> Yes! It means that Argyll's algorithms are consistent and don't distort
> colors without needs.
> You should use the reversal test - from AdobeRGB gradients to sRGB.
>
> > This is a 3-levels tiff with the original AdobeRGB gradient, the
> > sRGB/Relative and the sRGB/Perceptual ones:
> > http://darkbasic.homelinux.com/images/sv2/3_levels.tif (10.6 MB)
> >
> > You will need a wide gamut monitor to see the differences between
> > AdobeRGB and sRGB, otherwise you will have to use the color picker.
>
> I can just do perceptual conversion to my laptop display profile :)
>
> > Cheers,
> >
>
>
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- » [argyllcms] Re: gamut mapping. Excuse me for mistake. - Nikolay Pokhilchenko
