i generally don't like to do that in modperl unless i have enough webservers. i think its a bit of a waste of the mp resource.

i do this:
on upload, generate a thumbnail w/Image:Epeg (which is a super fast implementation of epeg. previously i compiled my own epeg tools and the perl mod is WAY faster ) and save the original have a cronjob that passes over new uploads and redoes the thumbnail and creates sized versions using the python imaging library ( much faster and way more powerful than the perl modules or image magick and way easier to code )

captchas - you can pregenerate a bunch then use rewrite to alias them. to me, its silly to generate them on the fly - its a rather tedious task. you can even have a cronjob create a new pool of captchas and a new map of filenames -> text in image every few hours if you want.

i'm ok w/using image:epeg, because it just scans the image for info and doesn't read the whole thing into memory.

i really hate doing image manipulation stuff in mod_perl or perl in general.

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