It will save the image as BMP even if JPEG compression is used. You can get my version here . Recommended reading for beginners in watermarking Petitcolas et. A translated version of the paper in Chinese is available in zipped WORD format. Peter Meerwald's page has a lot of results regarding wavelet-based watermarking algorithms.
Any comment is welcome.
Try this as an alternative to the generalised Gaussian distribution. All the above executables run under Windoze console, and you will need these DLLs to run them, unless you have matlab compiler installed.