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ICC V4 and PNG Specification broken in Firefox

  • 5 Antworten
  • 1 hat dieses Problem
  • 12 Aufrufe
  • Letzte Antwort von RodentCheese

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So, first off, Firefox is my favorite browser. I love it a lot. I'm also a pretty big supporter of Free and Open-Source Software.

With that said, I was wondering when and if Firefox will fully support ICC V4 profiles and the PNG specification.

I noticed that ICC V4 is not enabled by default, but even after setting gfx.color_management.enablev4 to true and setting gfx.color_management.mode to 1, ICC V4 is still not working properly.

You can test this yourself here: https://littlecms.com/blog/2020/09/09/browser-check/

Also, I noticed that PNG images of large sizes won't display at all in Firefox, resulting in a broken image icon.

You can test this yourself here: https://www.jwz.org/blog/2018/07/png-antics/

These seem to work at least passably well in other browsers, but I don't want to use other browsers! Does anyone know if Mozilla will fix these sometime? I do know that Little CMS is open-source under the permissive MIT license, so maybe Firefox could use that to fix the ICC V4 problem, if that could help. I don't know if using the latest version of libpng will help the other problem, but I know it is under a rather permissive BSD-style license.

I'm using Firefox 90.0.2 in case anyone is wondering.

Geändert am von RodentCheese

Alle Antworten (5)

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This is because Firefox does not actually support ICC v.4 although it does have a user preference to pretend that it is supported (so for example the adapted primaries and whitepoint are treated as unadapted).

See https://bugzilla.mozilla.org/show_bug.cgi?id=488800

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Are you possibly using a color profile for your monitor that is blocked on Mac by the sandbox?

  • bug 1524694 - [Mac] Fix gfx.color_management.display_profile for arbitrary profile paths [--]

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So, apparently qcms is the culprit behind why Firefox has an issue with ICC V4. Could Little CMS fix that? Also, I only have one color profile for my display, which is the one it came with. I never touched the color settings of the monitor.

Large PNG images are still not being rendered in any case.

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Is "large" means that width/height is bigger than 32000 px?

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Yep! The image I linked to is 111972 px wide. The image is supposed to be a debugging output histogram that shows where a certain program found silence in an MP3 file and removed them. The image is ludicrously huge because the MP3 was over 6 hours long. The image displays just fine in Opera, yet doesn't show up at all in Firefox.

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