At least if you use the Free Software Foundation's definition of free software, one requirement is access to the unobfuscated source code. If every copy of a fr

At least if you use the Free Software Foundation's definition of free software, one requirement is access to the unobfuscated source code. If every copy of a free-as-in-speech program binary's source code were deleted from existence by a god then the program would become proprietary. I would say that every image using a proprietary file format is proprietary. If the creator of such an image intends for the image to be otherwise free as in speech (any receiver can inspect, modify, redistribute with and without modification for any purpose), then the image can be made free if the image creator converts the image to a free format.