APNG Tag Problem

[jay123210599]

Do APNGs have the same problem as PNGs where, if made by ffmpeg, the APNG's will display incorrect colors in many programs, including browsers, because of gAMA and cHRM tag issues? If so, how do I fix it?

[poisondeathray]

Do APNGs have the same problem as PNGs where, if made by ffmpeg, the APNG's will display incorrect colors in many programs, including browsers, because of gAMA and cHRM tag issues? If so, how do I fix it?

Yes same problem if input file has colorimetry flags. Same fix

See this thread
https://forum.doom9.org/showthread.php?t=185921

See this post and the replies
But what about APNG? So even if I use a video with colorimetry flags, it will still get the wrong colors for PNG files because of the gAMA, cHRM tags? How do I strip them to solve the problem?

[jay123210599]

And if my input doesn't have colorimetry flags, it would use 601 colors instead of 709 ones, and we don't that. If I add colorimetry flags to my video and then convert it to PNG and APNG, I will have the tag issues, right?

[poisondeathray]

And if my input doesn't have colorimetry flags, it would use 601 colors instead of 709 ones, and we don't that.


Yes, 601 by default, unless otherwise specified. You can specify the conversion as mentioned in the other thread. Typically 709 is used for HD


If I add colorimetry flags to my video and then convert it to PNG and APNG, I will have the tag issues, right?

Yes, because it's now flagged. So use one of the methods that work - there were several of them listed


You're asking the same thing over and over again....

[filler56789]

You're asking the same thing over and over again....

But of course.

https://forum.videohelp.com/members/224252-gamemaniaco