Am 15.01.19 um 15:33 schrieb Christian Stromberg:
Hi,
thanks for the hints! It took me some time to fill up all missing
dependencies. Because it's the first time I am compiling a whole
program, I wasn't familiar with the specific library names for Linux
Mint. Looking them up and installing them while continuously running the
built script to see if a missing component was successfully installed
took the largest part of the time.
I've got the new version running and from my point of view, I can
happily report that the display of the files is absolutely identical
(see attachments). Thank you very much for your efforts!
Nice to hear!
Is sRGB know just used for displaying or is the export output also
restricted to sRGB?
Export is not restricted, you may chose the output gamut from some
pre-defined profiles and you may also use third party profiles. However,
right now PR1996 would be limited to sRGB on the *input* side when it
comes to CIELAB or ICCLAB Tiff files. Color dynamics outside of sRGB is
lost for these files.
The color profiles of the scanners I sent you have been created using
IT8 targets. So the range of colors included in these profiles is not
theoretical but a practical measurement using real slide films showing
IT8 color tables and correcting the scanners colors by using lab
measurements that are provided alongside the IT8 slide film targets.
This is also the reason why, using the same Fuji Provia 100F IT8 target,
the range of colors within the ICC profile of the Tango is much larger
than that of the Nexscan: the Tango is a drum scanner while the Nexscan
is a CCD based flatbed scanner.
I've checked your profiles and they are significantly larger than sRGB
or even AdobeRGB. In order to cope with these colors we would need to
internally convert to a wide gamut profile. Rec2020 and ProPhoto come
into mind. As darktable has already Rec2020 defined, this would be my
profile of choice in this case.
I'v just enhanced PR1996 accordingly.
Ulrich
But if export is not restricted to sRGB and it is just the displaying
part that uses sRGB, I would think that most users can live with that
just fine.
Best wishes,
Christian
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