Hi everyone,
Would appreciate any help in trying to figure out why the Argyll-built
profile is showing discontinuities in the shadows! Thank you.
Regards,
Samuel
On Mon, 3 Sep 2018 at 09:57, Samuel Chia <inksandpaper@xxxxxxxxx> wrote:
Hi,
I have a separate issue so I thought it might be less confusing to put it
out in a separate thread.
Because I'm using an iSis and having trouble using ArgyllCMS to generate
patch sets for CMYK profiling (an HP Indigo press) for an iSis since it's
not supported, I tried a 3000 patch set which was created in i1Profiler,
measured the patches, and asked ArgyllCMS to build a profile after
converting the spectral measurements text file to ti3.
This is the argument string I used for colprof:
colprof -v -qh -l400 -tlp -s 20 -cmt -ca:27 -cg:7 -dpp
KHLIndigo10000-Nevia-limit400-CalGlossyDefaults-31Aug18-SpectralM0-averaged-kh-s20-ca27-cg4
Here is the ti3 file which was used:
https://www.dropbox.com/s/txarthlw4ksvfgp/KHLIndigo10000-Nevia-limit400-CalGlossyDefaults-31Aug18-SpectralM0-averaged-kh-s20-ca27-cg7.ti3?dl=0
Here is the profile that was created:
https://www.dropbox.com/s/pyipen1bnud5y6w/KHLIndigo10000-Nevia-limit400-CalGlossyDefaults-31Aug18-SpectralM0-averaged-kh-s20-ca27-cg7.icm?dl=0
As one can see, both the Relative Colorimetric and Perceptual tables show
discontinuities in the gradients. For Perceptual, which is more important
to me, the multiple tone reversals are less though still present in the
dark colours. The neutrals are somehow unaffected.
When I generated an ICC profile in i1Profiler from the same measurement
data, this is the profile I get, which is smooth with no discontinuities.
https://www.dropbox.com/s/1iorgeyaite41k2/KHLIndigo10000-Nevia-Calglossy-18-08-31-M0averaged-TIC400-bs30mb100bcmedplusbw50-c0s0ng0-sm0.icm?dl=0
Perhaps I have entered something wrong into the argument string which is
causing Argyll to be unable to create a smooth profile? Thank you for your
time looking into this.
Regards,
Samuel
