PHP includes a similar set of functions [php.net] but my same worries about resource hogging apply...
This is interesting [oss.sgi.com]
Yep, I'm actually using the SGI stuff on a (minor) live site at the moment - so far so good.
Did you ever try ImageMagick?
I'm weighing a lot of different technologies out before I commit because when I get it rolling there's gonna be a lot of sites to build. I gotta be sure.
Plus I don't have my server situation worked out yet either...lots of unknowns for me like how many PHP nuke type sites can you put on a server? How server intensive is it for ImageMagick to resize a picture from straight out of a digital camera (@1 meg) down to web graphic file size (20K) etc. That is a great service to offer to less techno savvy people.
I'm kinda trolling for everything out there and then hashing it down to what really is gonna work the best.
I really like the PHP MySQL combo. But I've only been playing with it for a month or so. Obviously there's a lot more to learn.
BTW I picked up the ImageMagick idea from here [typo3.com]
It seems there's a ton of scripts for image manipulation over at hotscripts under php. I finally found a host who even knew what ImageMagick was. I still haven't gotten around to playing with it yet though. You will find however that there are 101 different ways to do what you want to do without Imagick.