Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

ICC V4 and PNG Specification broken in Firefox

RodentCheese
RodentCheese
more options

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.

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.

Modified by RodentCheese

All Replies (5)

TyDraniu
TyDraniu
  • Top 10 Contributor
more options

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

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

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 [--]
RodentCheese
RodentCheese Question owner
more options

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.

TyDraniu
TyDraniu
  • Top 10 Contributor
more options

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

RodentCheese
RodentCheese Question owner
more options

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.