[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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