if you could see a multi colored line or lines across part of the picture that was the hidden message. this one bit image though badly degraded was still recognizable as the original picture in black-and-white. Our pattern recognition ability is amazing. It's still required a human being to determine whether there was code or not code in the image. The way I did it was to clip the image on the least significant bit and then expand the least significant bit's contrast till you have an all black or white image. since I wrote this code and knew image format, I was able to find the hidden information. Hi Kirt Schafer, The only reason I could get PPMextract to detect the Hidden message is that the PPM file is a very simple image file with no compression.
