[argyllcms] Re: Print Validation
- From: <robert@xxxxxxxxxxxxxxxxxx>
- To: <argyllcms@xxxxxxxxxxxxx>
- Date: Fri, 17 Oct 2014 17:39:30 +0100
Hi Graeme,
I've tried the workflow you've suggested (below) to check my print accuracy
and my results are well off. Here are the first few (worst values):
No of test patches = 100
File 0 Chose patch 1 as white, xyz 0.964203 1.000000 0.824905
File 1 Chose patch 1 as white, xyz 0.837679 0.872949 0.741557
L*a*b* white reference = XYZ 0.964200 1.000000 0.824900
21: 18.038560 25.951478 22.489887 <=> 39.803954 11.831945 -35.079664 de
37.269236
28: 34.185591 -67.085881 -6.455341 <=> 62.944388 -90.026713 44.587042 de
34.884374
41: 40.524868 -33.803806 -52.438105 <=> 65.223756 -60.678084 -21.994298 de
29.777970
26: 52.908776 -78.403017 -17.947748 <=> 71.957265 -79.305174 41.137194 de
29.656735
12: 57.830887 -42.597937 -57.500006 <=> 76.080635 -62.957608 -8.243975 de
27.776304
So I'm clearly doing something drastically wrong!
I would really appreciate it if you would have a look at these commands to
see where the mistakes:
targen -v -d2 -G -f100 iPFTest
copy iPFTest.ti1 iPFRef.ti1
fakeread -v -Ir iPF6400_HP_ID_Satin.icm iPFRef
printtarg -v -r -ii1 -a1.0 -T300 -M6 -pA4 iPFTest
cctiff -v -e AdobeRGB1998.icc iPFTest.tif iPFTestO.tif
move /Y iPFTestO.tif iPFTest.tif
Pause Print iPFRef.tif using iPF6400_HP_ID_Satin.icm profile and Rel. Col.
chartread iPFTest
Pause The test results will be in iPFValidate.txt
colverify -v2 -N -k -s -w -x iPFRef.ti3 iPFTest.ti3 >iPFValidate.txt
I'm printing iPFTest.tif using Photoshop, RelCol to iPF6400_HP_ID_Satin.icm.
Many thanks!
Robert
-----Original Message-----
From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx]
On Behalf Of Graeme Gill
Sent: 15 October 2014 14:26
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Re: Print Validation
robert@xxxxxxxxxxxxxxxxxx wrote:
> I've tried your first method and it's just fine. I'll try the variation:
is
> that effectively equivalent to using profcheck?
Yes, it's going to be similar.
> I don't really understand your last suggestion.
In a proofing type workflow, the aim is to get a printer (or other
display device) to emulate some particular target colorspace. You do
this by transforming the colors you want to reproduce through a source
profile (which defines the target you are trying to emulate) and the
device profile.
If you want to check how accurate your proofing system is,
then the type of thing you might do is generate a test
set in the target device colorspace, and run it through the
source profile with fakeread to create the reference .ti3 file.
Then you run the same colors through your proofing workflow
(e.g. create a .tif using printtarg, then apply the source
to printer device link to the .tiff using cctiff and print it,
or run the .tif through whatever ICC based workflow you have
setup for proofing), measure the result and compare
the .ti3 to the reference using colverify.
Graeme Gill.
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