Legacy ImageMagick Discussions Archive

It looks like the GIF decoder has a problem somewhere.

Using this as img.gif: http://upload.wikimedia.org/wikipedia/c ... imated.gif

When I run :

convert img.gif[0] frame0.gif
...and...
convert img.gif[1] frame1.gif

I get the correct images.

But when I run:
convert img.gif[2] frame2.gif

The output is corrupt. It looks like a lot of the pixels have been set to white for some reason.

I also see that problem in frame 6.

I'd assume it was a bad GIF, but Firefox, and IE and all the on-line GIF frame extractors I tried were able to show all the frames without any problem.

(I'm using the IM 6.8.8 on Windows)

The frames of that gif image are optimized so each frame does not contain the exact version of that frame. If you want that you will have to -coalesce it first.
The delete operation first removes frames 0 and 1 and the second delete removes the frames from 1 till -1 (last image). This will allow you to get the second frame.

Edit (less code):

If you want to look at all gif frames, then a simple variation of the above from dlemstra is
you will get images, test-0.gif test-1.gif ... test-N.gif

ah. OK!
thanks.