> Sorry, this is the link to the picture: > https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0B1-BKwD5hqtZNWM3ZDM4NzYtOTgzNC00OTMyLWFkMmUtNGM3MzBhZGNjOTZm&hl=fr&authkey=CM2c-s0E i'd say, make an histogram of the image. If it tends to black, then apply for each filter a simple inversion filter (Pix = 255-Pix). Then you'd probably be able to read it the same way you read regular images (Unless you're also trying to read the "button" in the image, which isnt inverted).
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