I guess i should store some of my older stuff as well. Here is the "img2img" hider. The purpose of this software is to "hide" a smaller image into another. It takes two images as input, the "background" and a image to be blitted (Let's just call it "blit"-image). It tests the blit with all of the possible positions and angles through the background image and keeps record of the attributes with minimum error. These attributes will be outputted to the blitting phase.
The blitting considers a large variety of attributes from the error-detector, source and target images. it tries to blend these two image (areas) morphing the background as much towards the blit-image as possible within the error-limits specified for it.
Easier to explain with a video, the "img2img"-hider in action:
Since i wrote a completely automated version which tries all of the possible combinations of several hundreds of different images there are LOTS of screenshots available. You can check tens of pictures in my Flickr account (http://www.flickr.com/photos/tuomoti/).
Couple of examples. These are cropped from huge originals. NO other "by hand"-manipulation has been made: