[PHP] Best Lossless Hi-Res Photo Storage with PHP

[Galen]

I'm working on a photo site and most of it is working. The intent is to 
store original high-resolution photos that will only be accessed when 
purchased, and then a variety of thumbnails that will be accessed when 
viewing. Because they're high-resolution, I need maximal image 
compression but I can't sacrifice image quality. With hundreds (or 
more) of many megapixel images, space requirements quickly soar.

I am currently using PNG, but that's not all that great for lossless 
photo compression. JPEG 2000 is significantly better in terms of file 
size, but I haven't ever used that with PHP (and it seems I'll have to 
use it via ImageMagick or something). Are there any other (free) 
formats for high image compression out there that I can use (maybe even 
just via the shell) with PHP?

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