I know of three methods of storing info in an image. XMP, IPTC and EXIF. The problem is that IPTC and EXIF is only storeable in JPEG and TIFF. XMP is storeable in more image formats, but I havent seen any method of doing this with PHP's GD-functions. So my second thought was using imnagemagick. Is this supported?
I want to store copyright data in all my images so that I can easily open in a program and see if image is mine or even be able to create a script to check images for me..