RE: Is there an HDM CMM for MacOS or Windows7-8?
RE: Is there an HDM CMM for MacOS or Windows7-8?
- Subject: RE: Is there an HDM CMM for MacOS or Windows7-8?
- From: Roger Breton <email@hidden>
- Date: Wed, 13 Mar 2013 23:26:32 -0400
Quick follow-up...
The number of bits plays a pivotal role in the conversion results.
Take the Dark Skin patch from my venerable (read "old") ColorChecker chart.
1pro2 M0 measurement suggests Lab D50/2 of 38.25 14.61 14.43.
When I export to TIFF 8 bit, I "loose" precision in the ensuing conversion?
Converting to my CMYK output profile, AbsCol, for example, gives me 42c 65m 71y 27k.
Converting to my CMYK output profile in PatchTool (or Chromix?), presumably because the conversion is implicitely carried on a 16 bit level, I get 42.66c 64.87m 72.25y and 27.78k. Slightly less cyan, slightly more yellow and a tad more black.
It does not seem like a whole lot of difference but every bit of difference counts when evaluating proof colors in my application.
BTW, switching to 16 bit mode before converting a native 8 bit TIFF Lab, still gets the same result as If the conversion was done on an 8 bit document, that is I still get 42c 65m 71y 27k for my Input color.
So the conclusion here is to bring in 16 bit TIFF Lab precision in the first place in Photoshop, in order to enjoy 16 bit precision conversion all the way.
My bad :(
When I do, the conversion to CMYK becomes 43c 65m 72y 28k, the result I want.
Thank's for your patience and kind help.
Best / Roger
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