Re: SWOP Proof Certification, TRxxx Characterization Data
Re: SWOP Proof Certification, TRxxx Characterization Data
- Subject: Re: SWOP Proof Certification, TRxxx Characterization Data
- From: Todd Shirley <email@hidden>
- Date: Mon, 27 Oct 2008 00:15:05 -0400
Hi Klaus
I feel your pain! The Idealliance, GRACoL & SWOP stuff is poorly
organized to say the least. However, I think the data sets you are
looking for (in CGATS format) are available at: http://www.gracol.org/resources/datasetdownload.asp
Regarding tolerances: Ha! I threw a fit/rant about this same thing
back in April [http://lists.apple.com/archives/colorsync-users/2008/Apr/msg00319.html
].
There are NO official published tolerances that you can use "if one
simply wants to know which patches have to meet which criteria". This
doesn't exist for SWOP or GRACoL! Amazing but true. Personally when
I'm "certifying" a proof to be compliant to a SWOP or GRACoL dataset,
I use the ISO 12647-7 tolerances, which I believe are:
delta E paper: 3
delta E average: 3
delta E max: 6
delta E primaries: 5
delta H primaries: 2.5
delta H avg. CMY gray: 1.5
I really don't know what others are doing. Shocking isn't it?
There was a SWOP proofing study run by IDEAlliance over the summer
where they had volunteers submit data on a weekly basis for a couple
months in order to try to figure out what numbers people were actually
getting in the field. This is supposed to lead to published
tolerances, but obviously nothing has come out yet.
Regarding the IDEAlliance ISO12647-7 Control Strip, the CMYK values
for the patches are actually ON the control strip in tiny numbers
above and below each patch. Although the readme file doesn't make any
sense: <<"The file 'ISO12647-7_ControlStripV5.txt' contains the exact
CMYK percentages typed into the original Illustrator document." -- but
there is no file ISO12647-7_ControlStripV5.txt in the archive.>>, the
CMYK percentages ARE in the illustrator file.
All I can say about the aim values runaround is: can you even believe
it? The program I use to certify proofs comes with aim values, but
they appear to simply be the CMYK values run through the appropriate
profile using absolute rendering. It is rather mysterious why they
can't just publish the aims, isn't it?
Hope this stuff is of some help.
-Todd Shirley
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