I always expected steganography to be used to encode a compressed and encrypted datastream, not uncompressed images.  Such a compressed and encrypted datastream should be indistinguishable from noise, so not show in this kind of analysis.<p>My pet idea for doing steganography was to use nonstandard or suboptimal encoding sequences.  For compressed data formats, including images, music, video, and general files, there is almost always a choice of various encodings which will decompress to the same result.  Systematically varying a compression choice gives an invisible way to encode data.