Pixel data doesn't necessarily imply binary data, though. In the Plain PPM format, pixels are encoded as plain text RGB tuples separated by white space. It's no

Pixel data doesn't necessarily imply binary data, though. In the Plain PPM format, pixels are encoded as plain text RGB tuples separated by white space. It's not inconceivable for such a simple format that one could write a simple image processor in a few lines of shell + coreutils.