Re: [Lcms-user] Lcms-user Digest, Vol 135, Issue 3

[Jason C. <cam...@gm...>]

Christian,

Two things to add from my own efforts of similar intent:


  *   Adobe uses their own ACE (Adobe Color Engine) which does differ from Apple CMM and LCMS and others.  So even basic conversions I’ve tested will have some slight differences.
  *   Usually Absolute Colorimetric is used to force a source whitepoint to be simulated in the destination space.  I think LCMS has a whitepoint override but I don’t know the detail on where you need to insert that.  Others on the list might have detail on that piece.
  *   Preserving the numbers is an option on the handling of the file itself -- if it needs to, for some reason, NOT manage the RGB/CMYK build colors and preserve them in lieu of respecting the results of the transform.


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Date: Fri, 8 Feb 2019 11:50:40 +0100
From: Christian Schmitz <rea...@mo...<mailto:rea...@mo...>>
To: lcm...@li...<mailto:lcm...@li...>
Subject: [Lcms-user] LCMS questions for paper simulation

Hello,

We try to replicate here the display from Photoshop and there is an option for paper simulation.

Does someone know how to achieve this with LCMS2?

We already created a transform with CreateProofingTransform with image profile a source, monitor profile as destination and the device profile as transfer one with relative color metric intent (is that right?) and Flags Soft Proofing and BPC. The result looks close, but not exactly the same as in photoshop.

Also the is an option to preserve RGB or CMYK numbers.
I don't see an option for that.

Black point compensation is also a checkbox, but for that we found a flag.