[argyllcms] targen problem when used with a pre-conditioning profile
- From: Dave Karipides <dkcom1@xxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Tue, 07 Jun 2011 19:13:31 -0400
Hello,
I am having difficulty with targen when used with a pre-conditioning
profile. The command I am using is as follows:
targen -v -d4 -l300 -f1380 -c st7800_24hpglos_8c.icc -A.8
st7800_24hpglos_8c_precond
If I issue the command as shown above, the targen function seems to
operate as expected and finishes in 31 seconds.
Depending on the value I use for the adaptation parameter (-A), I get
odd / incorrect output. In some cases the program seems to output
believable results. In other cases, it returns only a small number of
the requested 1380 patches or sometimes seems to spin in a loop.
1) If I use an adaptation parameter of 0.7, the program finishes
after 40 seconds, but returns only 43 patches.
2) If I use an adaptation parameter of 0.899, the program seems to
operate as expected and finishes in 31 seconds.
3) If I use an adaptation parameter of 0.90, the program seems to
hang after iteration #2.
4) If I use an adaptation parameter of 0.901, the program seems to
operate as expected and finishes in 52 seconds.
5) If I use an adaptation parameter of 0.91, the program finishes in
37 seconds, but returns only 19 patches.
6) If I use an adaptation parameter of 0.92, the program seems to
operate as expected and finishes in 38 seconds.
7) If I use an adaptation parameter of 0.93, the program seems to
operate as expected and finishes in 31 seconds.
8) If I use an adaptation parameter of 0.94, the program seems to
operate as expected and finishes in 31 seconds.
9) If I use an adaptation parameter of 0.95, the program finishes in
31 seconds, but returns only 16 patches.
10) If I use an adaptation parameter of 0.96, the program finishes in
31 seconds, but returns only 17 patches..
11) If I use an adaptation parameter of 1.0, the program seems to hang
after iteration #5.
For reference, I am running version 1.3.3 of the tools on a 64 bit Linux
platform (Fedora). These profiles are for Gutenprint and are used to
drive an Epson 7800 printer in the CMYK color space.
I would appreciate any ideas on what may be happening here. If desired,
I can provide the pre-conditioning profile I am using. In the past, I
have used this initial/final profiling technique and have had excellent
results. I would like to understand what may be going on before I take
the time and effort to fine-tune the system.
Thanks,
Dave
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