[argyllcms] Re: Black Point Compensation

  • From: Gerhard Fürnkranz <nospam456@xxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Sat, 05 Oct 2013 19:05:16 +0200

BPC is normally not included in the profile, but computed by the CMM on the fly 
when it applies the profile.

-tla (luminance matched appearance) is possibly the most similar Argyll intent 
which you can put into the perceptual table (though still not exactly the same)


Joe Tschudi <tresorjoe@xxxxxxxxx> schrieb:
>Hello Graeme, Kai-Uwe
>>> BPC is now much in the heads of users. What is the equivalent to BPC
>>> Argyll?
>> Use a real perceptual gamut mapping - ie. either create the output
>ICC profile
>> perceptual table for the specific input colorspace, or create
>> a device link of the same transform. See
>> <http://www.argyllcms.com/doc/CrushedDisplyBlacks.html>
>Would that theoretically mean that using -S AdobeRGB1998.icc in colprof
>should deliver the same result for:
>1) Conversions using Relative + BPC
>2) Conversions using Perceptual
>(for example converted in Photoshop using Adobe (ACE) with selectable
>Black Point Compensation)
>I don't get the same result, what kind of -T parameter could give me
>the same conversion result in Perceptual as a Relative + BPC
>conversion, if there is any?
>Best regards,
>Joe Tschudi

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