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=item Acme::Steganography::Image::Png::RGB::556

Stuffs your data into a sample image, using the low order bits of each colour.
2 bytes of your data are stored in each pixel, 5 bits in Red and Green, 6 in
Blue. It produces a rather grainy image.

=item Acme::Steganography::Image::Png::RGB::323

Also stuffs your data into a sample image, using the low order bits of each
colour. Only 1 byte of your data is stored in each pixel, 3 bits in Red and
Blue, 2 in Green. To the untrained eye the image looks good. But the fact
that it's PNG will make anyone suspicious about the contents.

=item Acme::Steganography::Image::Png::RGB::556FS

Stuffs your data into a sample image, using the low order bits of each colour.
2 bytes of your data are stored in each pixel, 5 bits in Red and Green, 6 in
Blue. Changing the value of pixels to store data is adding error to the image,
in this case rather a lot of error. To attempt to conceal some of the
graininess Floyd-Steinberg dithering is used to spread the errors around. It's
not perfect, but effects are quite interesting, producing a reasonably nice