Been a while since I have messed this and I don't just remember where my stego cracking tool is.
I seem to recall that the first step is to convert the file into a lossless format such as .png or .bmp?
I will have a look over the weekend.
This might be a stupid question, but how does the changing of the format not lose the data? The bytes are all being changed. Especially dealing with lossless to lossy and vise versa.