Debian has disabled ICC support in mupdf. Because of this colors are
not always rendered correctly. In bug#952724 the "ICC support is not
available" has been (almost) disabled. Adding ICC support is easy:
git submodule add git://git.ghostscript.com/thirdparty-lcms2.git
thirdparty/lcms2
and comment the FZ_ENABLE_ICC=0 and USE_SYSTEM_LCMS2=yes lines in
debian/rules.
I will only enable this if Debian's lcms2 version works. I am happy to
take patches.
That's not possible, at least not currently, see
https://raw.githubusercontent.com/plangrid/ghostpdl/master/lcms2mt/doc/WhyThisFork.txt
.
What is the problem with the above? The lcms2mt library is built into the
four mupdf binaries, and each one is about 1.5% larger.