[argyllcms] Re: A few questions + an idea for spyd2.c (this time even more useless than before!)
- From: Nikolay Pokhilchenko <nikolay_po@xxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 11 Mar 2009 23:57:35 +0300
> Dear Nikolay!
>
> > You should check Your profile by the other set of points, than the
> > profile built.
> Thank you for your suggestion.
>
> I do fully agree with the approach you proposed! Unfortunately I do not know
> how I
> should deal with that... Do you know of any way of generating the
> testing points that would be different from 2000 points I used when
> generating the profile? I have the .ti1 and .ti3 files used to
> generate the profile.
>
For example:
1. You have successfully built the profile from 2000 points. It's OK. The name
of profile "Profile.icc" for example.
2. You need to generate a test set.
The best of all, IMHO, will be uniform perceptual spread over Your device
gamut, so targen is needed:
targen -v -d3 -f 100 -e 1 -c "Great.icm" -I -w Test_100
Now You have another "Test_100.ti1", which contain 100 test patches, most of
them are unmatched with Your original 2000-patches of "Profile.ti1". It's Your
validation set.
3. You have to measure the test set in the same conditions, as profile work:
dispread -v -yl -k "Profile.cal" Test_100
Now You have the measured validation data "Test_100.ti3"
4. You do the validation of Your profile:
profcheck -k -x -w -e Test_100.ti3 Profile.icc
Now Your 2000-point profile have checked by another 100 (92) test points! The
result of profcheck reflects the real profile quality.
5. After all You can combine Profile.ti3 and Test_100.ti3 files into one
2100.ti3 without any measurements. Just by adding 100-patches dataset after
2000 patches of Your original *.ti3. Don't forget to change NUMBER_OF_SETS
value to 2100 :) . If You do the 2100-points profiling again with the same
parameters as initially, the new profile need not a new validation. It's errors
will be within the validation result at 4-th point.
It's my workflow. Any comments, suggestions?
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