![]() Next, open the image in MS Paint, or similar program. Right click on the image, and select "Save picture as", then choose a place, such as your desktop, where the image will be readily accessible. Other programs may vary slightly in how they perform the tasks illustrated below, but interpretation and adaptation shouldn't be too difficult.įirst, copy the stamp's image to your hard disk. This tutorial will guide you through the steps of such a test, using MS Paint. There is a very simple test one can perform with the image of such a stamp called a "flip-comparison" test, that can be done with a program such as MS Paint. How to do a "flip-comparison" test on perforations FLIP-COMPARISON TEST INSTRUCTIONSįrequently stamps are offered on eBay that seem to have perforations so irregular the suspicion arises that they have been faked.
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