Outside the scope of the developers list, in future direct this type of question ot the user lists. In short see IM Examples
Recovering an Image Overlay
http://www.cit.gu.edu.au/~anthony/graph ... e/#overlay
You only need the mask stuff. After that fuzzy trim it to find its dimensions, and ignore any spurious small matches.
http://www.cit.gu.edu.au/~anthony/graph ... #trim_blur
retrieving only the image portion
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