Fixed Uploaded animated gifs flicker

[x3sphere]

I'm running the latest version of ImageMagick (6.7.7) and PECL extension (3.1.0RC2). Animated images that are uploaded through XenForo flicker. It's almost like a tearing effect.

You can see what I'm talking about here (look near the top):

http://i.picpar.com/dadfdb91f82ac16ec4431c074a70efe679995f42.gif

I tried converting an image directly with IM and the tearing artifacts aren't present, so it's either XF or the PECL extension I suppose.

 

[x3sphere]

Under further review I've found this only happens with GIFs that are upscaled.

 

[Mike]

Right, I've managed to track this down. "Deconstruct" is a useful optimization, but it fails on certain GIF types. I've now changed to use a general optimization approach for resized GIFs that seems to work without issue.