[Pkg-gmagick-im-team] Bug#674097: Buggy output with -layers OptimizeFrame

[H. S. Teoh]

Package: imagemagick
Version: 8:6.7.4.0-5
Severity: normal

Somewhere between 6.6.* and 6.7.*, something went wrong with convert's
-layers OptimizeFrame. When assembling an animated .gif from a series of
images (all of exactly the same dimensions), when -layers OptimizeFrame
is specified, an extraneous border is added to the right and bottom
edges of the resulting .gif. When -layers OptimizeFrame is omitted, the
resulting .gif has the same dimensions as the input frames, as expected.

This extraneous border is sometimes white, sometimes black.

Example buggy output:

	convert -delay 150 /usr/share/icons/gnome/48x48/mimetypes/libreoffice-* -layers OptimizeFrame /tmp/test.gif
	identify /tmp/test.gif

All input files are 48x48, but the resulting .gif has dimensions 60x66.
This is wrong, since optimizing frames should never increase the size of
the original input frames.  If -layers OptimizeFrame is omitted, then
the output is normal (48x48).

If the input files have transparency, the border is black -- very
noticeably buggy output.


T

-- 
It's bad luck to be superstitious. -- YHL