RE: SWOP Proof Certification, TRxxx Characterization Data
RE: SWOP Proof Certification, TRxxx Characterization Data
- Subject: RE: SWOP Proof Certification, TRxxx Characterization Data
- From: Roger Breton <email@hidden>
- Date: Mon, 27 Oct 2008 06:32:34 -0400
Todd,
I believe the "tolerances" are in the Proofing Certification PDF to be sure.
These are the tolerances used by IDEAlliance to certify proofing systems at
RIT. You ask ColorBurst, Oris, GMG and EFI, to only name these, and they
will tell you what the tolerances are, for proofing. I could (as you
certainly could too, but I really feel for Klaus) dig out a link for that
document on the www.gracol.org web site but maybe Don Hutchison who is
probably lurking here could provide it in the name of IDEAlliance. Those
numbers do follow ISO-12647-2 tolerances for the primaries and the
overprints and the susbstrate, and there is a specific tolerance of 1.5
deltaE for the Highlight Range patch (50c40m40y). And the Max deltaE cannot
be more than 6 for 95% of the patch. And the avg delta for all the 1617
patches cannot exceed 1.5. I use BabelColor's PatchTool to analyze and
certify all proofs that come my way. Since I use a DTP70 (not *the* DTP70
used up at the the Print Application Lab at RIT, obviously) I feel my
results are as potentially close to the RIT numbers as can be. True,
IDEAlliance with the help of Chromix have conducted a stability study of
instruments over the course of the summer. But I don't think the results are
out yet. I know I tried to participate but zillions of things have kept me
away from it :(
Roger
> 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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