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Steganography can hide one image inside another.

If we have a compression algorithm that allows us to fit the bits for two images into the size of one, can we think of a way to modify a run-length encoding algorithm to take two images and produce one, in such a way that the first is retrieved in a lossy way, and the second is retrieved?

Please explain this with full description of your thinking.

If you know a good reference, please let me know.

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Steganography can hide image inside another.But if you change the run length encoding algorithm it's not like you are hiding your data.Because the common decoder is not aware of your run length encoding and display some creepy image.

Instead you can do this.Consider you have two 8 bit images Image-1(Envelope image) and Image-2(The image you need to hide).Store them as a one 16 bit image say Image-3 with Image 1 occupying the MSB and Image-2 at LSB. When displayed using any photoviewer Image-3 and Image 1 will look similar. No one will be having idea of Image2. Afterwards you can get image-2 by extracting last 8 bits.

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