in reply to BMP: Drawing or photograph?

if it should be converted to PNG or JPEG by analyzing the picture and figuring out if its a drawing or a photograph.

Which would you use for which? And why?

Both formats can represent either. JPG can be more compact; but is lossy. PNG is non-lossy and does a pretty good job of compaction commensurate with not throwing away information.

For my taste, png is a far better format for either; but "best" depends completely upon your criteria?

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