[argyllcms] Re: Black Point Compensation

  • From: Joe Tschudi <tresorjoe@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Mon, 7 Oct 2013 10:08:49 +0200

Hello Graeme

I was looking to pre-compute the result of a relative + BPC conversion into the 
Perceptual table. Like this we could avoid issues from the BPC algorythm in 
other applications and CMMs. Another advantage would be that the black point of 
a source RGB (e.g. AdobeRGB1998 RGB 0/0/0) could be preserved, as it is 
currently using B2A0 conversions with Argyll (which is great by the way).
In addition to this: Is there any method I can toggle for out-of-gamut mapping 
other than CIECAM02? I am looking for dE2000 for example.


Am 07.10.2013 um 08:57 schrieb Graeme Gill <graeme@xxxxxxxxxxxxx>:

> Joe Tschudi wrote:
>> 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)
> No, I wouldn't expect exactly the same result - they are different intents, 
> and Adobe
> BPC is not the same black mapping as Argyll gamut mapping, which is done in 
> space and uses different algorithms.
> Graeme Gill.

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