[Resolved] possible bug disposal background IM 6.7.7.6

[fmw42]

IM 6.7.7.6 Q16 Mac OSX Snow Leopard

I am not sure if this is a bug or not. But I am lead to believe that -disposal background should clear the frame to transparent background before going on. Anthony's example at http://www.imagemagick.org/Usage/anim_b ... background seems to be leaving black holes rather than transparent. Do I misunderstand or is this a bug.

[anthony]

It doesn't for me!

[fmw42]

It doesn't for me!

On Safari it has a white background and leaves black squares. On Firefox it has a transparent background and is fine.

So it appears to be a limitation of Safari.

Fred

[anthony]

I was testing with "animate".

[fmw42]

I was testing with "animate".

It was a test for something I am scripting and want to show as an animation on my web site. So I needed to use a browser to test. Too bad Safari is not up to speed on disposal methods in gif animations.

[Offshore]

Same problem:
convert -delay 15 -dispose background ...files... -channel A -ordered-dither o8x8 result.gif

The result (view on Safari to see the bug, appears on Safari for Windows, on iPad 2, on New iPad, possibly Safari for MacOS and iPad 1):


In Opera, Chrome (webkit engine, as Safari), IE and Firefox everything is fine.