GIFs created with visual errors

[29thfloor]

I'm using a Wordpress plugin that uses this and GifFrameExtractor to resize animated GIFs. For the most part it works great but with certain GIFs, visual errors are introduced in the resized versions.

Here's an example:

Original:

Resized:

I know you're not responsible for the Wordpress plugin, but I'm just trying to figure out what's going on. The errors seem to be consistent - ie, if I resize the image multiple times the errors in the resized versions look exactly the same.

I can provide more examples if it would help figure out the problem. It seems more likely to happen when there are large sections of a single color (in this case white).

[sonnb]

I am getting same issue with normal resizing script.