Legacy ImageMagick Discussions Archive

I'm using a piece of forum software (Lithium), and its image encoding is backed by ImageMagick although I cannot directly see or access its configuration and parameters. I'm hoping someone here can help me work out what's causing this strange issue so I can push the devs to fix it.

Here's one of the images used as an avatar. It is a 17-frame 8-colour GIF of a ball rotating, with a little glint/sparkle on the 16th frame.



The software encodes each image uploaded, and this is what comes out.



The issue isn't actually on the glint/sparkle frame. It's on the succeeding frame, the final one.

Does anyone know what would cause an issue like this?

There are 17 frames. Numbering them from 1, number 16 has the glint.

The first GIF you show is good. It is uncoalesced (ie compressed; each frame stores just differences).

The second GIF you show has a bad final frame. It is the same as the final uncoalesced frame from the first GIF. It seems only the first 16 frames were coalesced. I don't know what might cause that.

It seems the software did something like this: ... but something went wrong.

Can you ask what version of IM they used? If they used a command-line, what was it?