Steganography (pronounced STEHG-uh-NAH-gruhf-ee, from Greek steganos, or "covered," and graphie, or "writing") is the hiding of a secret message within an ordinary message and the extraction of it at its destination.
Normally RGB encoded messages have 8 bits per colour channel: 0 to 255. If however the colour channels are using only 7 bits there will be no impact on the visual image quality and that last remaining bit can be used to hide data in. You will need 8 pixels for a byte of data, but in an 800x600 image you can hide 60,000 bytes that way.
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