[Bug 28631] Animated GIF has black artifacts when scaled

2011-08-13 Thread bugzilla-daemon 
https://bugzilla.wikimedia.org/show_bug.cgi?id=28631

Tim Starling  changed:

   What|Removed |Added

 CC||tstarl...@wikimedia.org

--- Comment #10 from Tim Starling  2011-08-13 11:46:46 
UTC ---
(In reply to comment #5)
> I'm a bit unclear on if/where there's a bug tracker for ImageMagick, but there
> are forums where you can report bugs in the 'bugs' section. I don't see any
> entries searching for 'map animated gif'.

They use phpBB. Follow the "discourse server" link at the bottom of the
ImageMagick home page. 



John Cristy (a.k.a. magick) is extremely responsive to new posts there, he
often commits a fix within a day. But you should try to isolate the bug a bit
better than what I see above if you want to report it upstream. It's not clear
to me from the comments above whether there is any ImageMagick bug. Nobody here
seems to know what +map is meant to do, so maybe it's working as intended.

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[Bug 28631] Animated GIF has black artifacts when scaled

2011-06-08 Thread bugzilla-daemon 
https://bugzilla.wikimedia.org/show_bug.cgi?id=28631

Derk-Jan Hartman  changed:

   What|Removed |Added

 CC||hart...@videolan.org

--- Comment #9 from Derk-Jan Hartman  2011-06-08 13:31:06 
UTC ---
(In reply to comment #5)

> In theory an animated GIF can have different color maps for each frame, but I
> don't know if that's a case that's actually hitting stuff.

Not theory, I believe this is why I added the option in the first place. Should
be somewhere in our bugzilla history.

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[Bug 28631] Animated GIF has black artifacts when scaled

2011-05-01 Thread bugzilla-daemon 
https://bugzilla.wikimedia.org/show_bug.cgi?id=28631

Mark A. Hershberger  changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 Resolution||FIXED

--- Comment #8 from Mark A. Hershberger  2011-05-01 
20:20:09 UTC ---
marking fixed for now.

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[Bug 28631] Animated GIF has black artifacts when scaled

2011-04-28 Thread bugzilla-daemon 
https://bugzilla.wikimedia.org/show_bug.cgi?id=28631

--- Comment #7 from Mark A. Hershberger  2011-04-28 
20:25:13 UTC ---
Took +map out in r87099.  Not setting this to FIXED because it needs more
testing.

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[Bug 28631] Animated GIF has black artifacts when scaled

2011-04-28 Thread bugzilla-daemon 
https://bugzilla.wikimedia.org/show_bug.cgi?id=28631

--- Comment #6 from Mark A. Hershberger  2011-04-28 
19:40:35 UTC ---
(In reply to comment #5)
> I'm a bit unclear on if/where there's a bug tracker for ImageMagick, but there
> are forums where you can report bugs in the 'bugs' section.

Yeah, I couldn't find one either.  Gonna send someone an email, I guess.

But I think it would be worthwhile to take out the "+map" parameter for
animations since it is (evidently) doing more harm than good.

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[Bug 28631] Animated GIF has black artifacts when scaled

2011-04-27 Thread bugzilla-daemon 
https://bugzilla.wikimedia.org/show_bug.cgi?id=28631

--- Comment #5 from Brion Vibber  2011-04-28 00:54:48 UTC 
---
I can confirm here with ImageMagick 6.6.2-6 (Ubuntu 10.10 x86_64).

The '+map' (along with the -fuzz and layer optimization) was added in r71354
for bug 11822:

  "I also tried adding +map to reduce to prevent per
  frame colortables, but this option doesn't deal very well with transparency
  unfortunately (because it does significantly reduce filesize)."


My current man pages don't list the '+map' option for convert, but older ones
floating on the internet do:

==
-map filename
choose a particular set of colors from this image.

By default, color reduction chooses an optimal set of colors that best
represent the original image. Alternatively, you can choose a particular set of
colors from an image file with this option. Use +map to reduce all images
provided on the command line to a single optimal set of colors that best
represent all the images.
==

The '+map' tells it to rebuild the colormap from the input files, so presumably
this is behaving differently from the default (given that it's the same input
file, still). Somehow in the process of converting colors we lose some of the
transparency, and various chunks of various frames are getting mapped to a
non-transparent color by mistake.

In theory an animated GIF can have different color maps for each frame, but I
don't know if that's a case that's actually hitting stuff.

I'm a bit unclear on if/where there's a bug tracker for ImageMagick, but there
are forums where you can report bugs in the 'bugs' section. I don't see any
entries searching for 'map animated gif'.

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[Bug 28631] Animated GIF has black artifacts when scaled

2011-04-27 Thread bugzilla-daemon 
https://bugzilla.wikimedia.org/show_bug.cgi?id=28631

--- Comment #4 from Mark A. Hershberger  2011-04-28 
00:15:40 UTC ---
Note that removing the "+map" option not only gets rid of the
artifacts, it also reduces the final size (in this case) from 143253
to 137632 bytes.

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[Bug 28631] Animated GIF has black artifacts when scaled

2011-04-25 Thread bugzilla-daemon 
https://bugzilla.wikimedia.org/show_bug.cgi?id=28631

Mark A. Hershberger  changed:

   What|Removed |Added

   Keywords|triage  |
   Priority|High|Normal

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[Bug 28631] Animated GIF has black artifacts when scaled

2011-04-25 Thread bugzilla-daemon 
https://bugzilla.wikimedia.org/show_bug.cgi?id=28631

--- Comment #3 from Mark A. Hershberger  2011-04-26 
03:15:10 UTC ---
Command line to reproduce with the above image:

convert -quality 95 -background white Bouncywikilogo.gif -coalesce -thumbnail
120x120 -depth 8 -auto-orient -fuzz 5% -layers optimizeTransparency +map
thumb.gif

Removing "+map" gets rid of the artifacts, though.

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[Bug 28631] Animated GIF has black artifacts when scaled

2011-04-22 Thread bugzilla-daemon 
https://bugzilla.wikimedia.org/show_bug.cgi?id=28631

--- Comment #2 from Bryan Tong Minh  2011-04-22 
18:29:17 UTC ---
Can reproduce with Windows ImageMagick 6.6.4-0 2010-09-04 Q16

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[Bug 28631] Animated GIF has black artifacts when scaled

2011-04-22 Thread bugzilla-daemon 
https://bugzilla.wikimedia.org/show_bug.cgi?id=28631

Mark A. Hershberger  changed:

   What|Removed |Added

   Keywords||triage

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[Bug 28631] Animated GIF has black artifacts when scaled

2011-04-22 Thread bugzilla-daemon 
https://bugzilla.wikimedia.org/show_bug.cgi?id=28631

Mark A. Hershberger  changed:

   What|Removed |Added

   Priority|Unprioritized   |High
 CC||m...@everybody.org

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[Bug 28631] Animated GIF has black artifacts when scaled

2011-04-20 Thread bugzilla-daemon 
https://bugzilla.wikimedia.org/show_bug.cgi?id=28631

Bawolff  changed:

   What|Removed |Added

 CC||bawolff...@gmail.com
Summary|Animated GIF is not working |Animated GIF has black
   |properly when scaled|artifacts when scaled

--- Comment #1 from Bawolff  2011-04-20 20:57:27 UTC ---
Probably related to bug 27859 (Except that one appeared to stop happening,
where this one is still current).

Probably some upstream issue with imageMagick...

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