Magic PNG Generator

This tool generates a single PNG image from two different ones. The trick is that one image will only be shown by various thumbnail renderers (Facebook, 4chan, Reddit etc.), Apple and Windows PNG viewers while the other image will be shown by Firefox and Google Chrome (and everything using libpng for rendering).
Thanks to Tristan Hume for explaining the method here!
For best result it's recommended that the two images are the same size.

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