I'm fairly new to selling my images, and I have a question. Since many of the online image galleries (smugmug, etc) allow you to print multiple sizes of photos from a single image, what is the most appropriate aspect ratio to use when cropping photos? It would be nice if 8x10, 4x6, 5x7, etc were all the same aspect ratio, but unfortunately they're not.
Currently, I just crop way too wide, to make up for any differences,but that seems sort of... arbitrary and lends itself to making galleries look a bit unprofessional since they may all be slightly different aspect ratios. I remember reading somewhere that 8x10 is preferred, but I can't remember where or why that was the case.