media-libs/libpng-1.6.37-r2 does not display images encoded with a Rec. 2020 PQ colorspace (High Dynamic Range) correctly, instead making the image incredibly dark and hard to view. This effects all dependent software, including libQt5
Compared to what? * -r2 fixed a broken symlink over -r1 * -r1 just bumped EAPI Could you give some more information please? And emerge --info?
Portage 3.0.13 (python 3.7.9-final-0, default/linux/amd64/17.1/desktop, gcc-9.3.0, glibc-2.32-r3, 5.10.11-gentoo x86_64) ================================================================= System Settings ================================================================= System uname: Linux-5.10.11-gentoo-x86_64-Intel-R-_Core-TM-_i5-6500_CPU_@_3.20GHz-with-gentoo-2.7 KiB Mem: 16374940 total, 229764 free KiB Swap: 6291452 total, 5446908 free Timestamp of repository gentoo: Mon, 08 Mar 2021 04:30:01 +0000 Head commit of repository gentoo: 75204d1fd4c4e1d6464d0eca88be8a4335a2acc6 Head commit of repository trinity: f994447b579414ca7d6ee4881195b4b14443312b sh bash 5.0_p18 ld GNU ld (Gentoo 2.34 p6) 2.34.0 distcc 3.3.3 x86_64-pc-linux-gnu [disabled] ccache version 3.7.12 [disabled] app-shells/bash: 5.0_p18::gentoo dev-java/java-config: 2.3.1::gentoo dev-lang/perl: 5.30.3::gentoo dev-lang/python: 2.7.18-r4::gentoo, 3.7.9::gentoo, 3.8.6::gentoo, 3.9.0::gentoo dev-util/ccache: 3.7.12::gentoo 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================================================================= Package Settings ================================================================= media-libs/libpng-1.6.37-r2::gentoo was built with the following: USE="apng -static-libs" ABI_X86="(64) -32 (-x32)" CPU_FLAGS_X86="sse"
How about the rest? :)
(In reply to Sam James from comment #3) > How about the rest? :) I'm not sure exactly what your asking for. Do you want a side by side comparison of the raw source image in the editor, srgb encoded image in view, and rec. 2020 PQ encoded image in a viewer?
(In reply to Thomas Groman from comment #4) > (In reply to Sam James from comment #3) > > How about the rest? :) > > I'm not sure exactly what your asking for. Do you want a side by side > comparison of the raw source image in the editor, srgb encoded image in > view, and rec. 2020 PQ encoded image in a viewer? "Compared to what? * -r2 fixed a broken symlink over -r1 * -r1 just bumped EAPI" So, 1.6.37-r2 is broken. But what worked?
(In reply to Sam James from comment #5) > So, 1.6.37-r2 is broken. But what worked? Oh, I'm not aware of any previous version that worked correctly. I just noticed some contacts in my XMPP roster had very dark icons, then a few weeks later I made some art in Krita and curiously enabled the 'Rec. 2020 PQ' option in PNG export, and noticed the same exact over-darkness happened to the exported png and this did not happen when that option was left disabled.
(In reply to Thomas Groman from comment #6) > (In reply to Sam James from comment #5) > > So, 1.6.37-r2 is broken. But what worked? > > Oh, I'm not aware of any previous version that worked correctly. I just > noticed some contacts in my XMPP roster had very dark icons, then a few > weeks later I made some art in Krita and curiously enabled the 'Rec. 2020 > PQ' option in PNG export, and noticed the same exact over-darkness happened > to the exported png and this did not happen when that option was left > disabled. I contacted the developer in the XMPP client and they said it just uses what libQt5 uses for png support, which a quick ldd on libQt5.so reported that was libpng
Thomas: can you append the test image to this PR? There's no information in the PNG format that records PQ is being used. There is a proposal for PNG v3 in the W3C working group but it requires a new chunk (cICP) and supporting that chunk *inside* libpng will require a significant amount of software development. This is unlikely to happen unless the W3C working group provides a complete patch; indeed it's not clear how to do it given the traditional RGB interface of libpng.