Security: malicious user could waste resources

[7uxifer]

As there is no upper bound on the size of an image, a user could create millions of huge images with a simple Postman script.
I'd suggest at least the option to say don't scale an image larger than the original, (or some configurable value) and possibly a granularity so images aren't created that are 300px, 301px, 302px...600px for each of your hosted images.