Image Staganography Algorithms

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I am doing the research about Image Steganography. I have researched about S-Tools, ImaheHide and other related to Image Steganography tools. However, I am trying to find what are the methods can be used to hide the secret message inside the Image. So far I found out that most and maybe all of the today's Steganography tools are using Least Significant Bit (LSB) algorithm. But I cannot find other similar Steganography algorithms like LSB. I would appreciate if some of you can name other similar methods like LSB.

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Evan Sand On

It is also possible to change the least significant 2 or 3 bits, which is not really visually detectable, especially in camera photos. If you want, I can provide source code (in C).