SHAdow generates, from two JPEG images, two different PDF files having the same SHA-1 sum.
./shadow.py <img1> <img2> <width> <height>
For example :
./shadow.py sun.jpg water.jpg 640 480
This generates shadow1.pdf and shadow2.pdf in the current folder.
Two images are provided :
./shadow.py tux.jpg troll.jpg 200 200
The input images must have the same size, and their files must be smaller than 64K.
I wrote a blog article, in French: SHAdow.
