I bought this app yesterday for use on my iPhone 16gb 3Gs and first generation iPad . Soon after I discovered the largest file size I can save is 2048x1535 or 3.1 megapixels which is the native size on the 3Gs.
Contacted Support via live chat and at their request emailed a file with some screen shots from both my iPhone and Mac. Nawal of Red Giant Software emailed me a day later and said "Plastic Bullet cannot enlarge the size of your photo, it can only develop at its original resolution. "
The app does produce nice photos effects but Im disappointed by the file size. 3.1 megapixels is a far cry from the 12 megapixel photos claimed by this developer.
FotoDogue about Plastic Bullet, v2.01