I didn't change anything in my program yet (besides copying copy.c to whodunit.c) and tried to run the command "./whodunit clue.bmp verdict.bmp" which is given in the instructions. When I did that the error "Unsupported file format." came up. As I didn't change anything I'm confused as to why this message is happening. Shouldn't it output the clue.c picture in the file verdict.c?