I'm investigating but the .png file is a bit weird. Carpaccio, was the image stored exactly like this or did you have to use some kind of extractor? I ask because I assembled one of the images by hand, and there are some strange artefacts that I can only imagine are due to incorrect image decoding.
Another weird thing is that each chunk doesn't go directly below the previous one, but it goes 2 pixels higher than that. It's really odd.
Another weird thing is that each chunk doesn't go directly below the previous one, but it goes 2 pixels higher than that. It's really odd.