Would just like to share my experience with this mod.
I installed this mod, after following every step upto the Max Height resize, the mod won't work. I'm not getting any errors but it wouldn't resize my images.
I thought it was a problem in the mod or script, at last I discovered, it was a problem with my ImageMagick installation and NetPBM. After figuring this out, everything worked perfectly.
Just thought maybe it would save you guys from a lot of wasted debugging time. Thanks Vano!!!