[Mediawiki-l] Error creating thumbnail: Invalid thumbnail parameters

[Henry Hartley]

I've just uploaded a largish GIF image to my wiki and I'm getting an 
error that says:

   "Error creating thumbnail: Invalid thumbnail parameters"

I say largish but it's not really that big a file (4,865 by 3,300 
pixels, 410 KB). The file uploads without other problem and I was able 
to manually create a thumbnail at the command line (on the server) using 
ImageMagick (which is what MW is set to use).

I couldn't find the phrase "Invalid thumbnail parameters" anywhere on 
the MediaWiki site. It's not clear from the error what "thumbnail 
parameters" might be "invalid". Any suggestions what might need to be 
fixed or adjusted?

This is MW 1.13.3
PHP 5.1.6
MySQL 5.0.45
ImageMagick 6.2.8.0-4.e15_1.1
CentOS 5.2

-- 
Henry