[argyllcms] Re: output ICC gamut in RGB
- From: <robert@xxxxxxxxxxxxxxxxxx>
- To: <argyllcms@xxxxxxxxxxxxx>
- Date: Sun, 26 Oct 2014 22:09:57 -0000
Much obliged Ben!
Two new tools I had seen but not thought to use.
A couple of questions:
1.
If I use xicclu like this:
xicclu -ff -ir profile.icm < rgbValues.txt > rgbLabValues.txt
Am I correct in assuming that the input space (say AdobeRGB) for the
conversion will be defined by profile.icm? I can see how that would work
with Argyll as one specifies the input space when making the profile, but
what about i1Profiler, say? As far as I'm aware, there is no way of
specifying the input space to i1Profiler. I asked Graham about this a while
back and he didn't know how i1Profiler can build an output profile without
knowing the input space. A bit of a puzzle!
2.
I've been verifying profiles like this:
========================================================================
targen -v -d2 -G -f100 iPFTest
copy iPFTest.ti1 iPFRef.ti1
printtarg -v -r -ii1 -a1.0 -T300 -M6 -pA4 iPFTest
cctiff -v -ir -e iPF6400_HP_ID_Satin.icm iPFTest.tif iPFTestO.tif
move /Y iPFTestO.tif iPFTest.tif
fakeread -v -Ir iPF6400_HP_ID_Satin.icm iPFRef
Pause Print iPFTest.tif using no color management.
chartread iPFTest
Pause The test results will be in iPFValidate.txt
colverify -v2 -N -k -s -w -x -L iPF6400_HP_ID_Satin.icm iPFRef.ti3
iPFTest.ti3 >iPFValidate.txt
=========================================================================
Would something like this be the equivalent, using profcheck?
=========================================================================
targen -v -d2 -G -f100 iPFTest
printtarg -v -r -ii1 -a1.0 -T300 -M6 -pA4 iPFTest
cctiff -v -ir -e iPF6400_HP_ID_Satin.icm iPFTest.tif iPFTestO.tif
Pause Print iPFTestO.tif using no color management.
chartread iPFTest
Pause The test results will be in iPFValidate.txt
profcheck -v2 -k -w -x -Ir -p iPFTest.ti3 iPF6400_HP_ID_Satin.icm
iPFTest.ti3 >iPFValidate.txt
=========================================================================
Thanks,
Robert
-----Original Message-----
From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx]
On Behalf Of Ben Goren
Sent: 26 October 2014 19:32
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Re: output ICC gamut in RGB
On Oct 26, 2014, at 11:30 AM, Robert@xxxxxxxxxxxxxxxxxx wrote:
> However, the image doesn't have to be a photograph - it could be a
gradient, for example, or a wedge made from a gradient. What the code needs
to do is not to give every pixel value, but every color value, within a
given tolerance (perhaps a dE00 of 5 for a gradient or dE of 0 for a wedge).
In that case, xicclu is the tool you want. Don't bother making a TIFF and
trying to extract the RGB values from it; just make the RGB values you want
and feed them straight to xiiclu. Any permutation of profiles, direction,
whatever, that you can think of is possible.
> it could be a very useful tool to analyse parts of a profile that seem to
be giving
> problems.
Those sorts of analyses are generally done through visual inspection of the
surface of a 3-D gamut plot; look for anything that's not smooth. And the
solution is almost always to improve processes and techniques...make sure
the printer doesn't have any clogged heads or other problems that makes it
inconsistent, make sure the paper doesn't have irregularities that causes
other inconsistencies, make sure your scanning technique is good, and so on.
But my own personal favorite method is to run profcheck and sort the output;
that'll tell you the worst samples. Once you figure out what you need to do
to fix those, either all your problems will be solved or you'll have a good
idea of how to fix the next-worst samples, and so on.
b&
Other related posts:
