Good picture: Difference between revisions

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 Some object like banknotes may have transparent areas
 As we ask for 2 pictures and use both to analyze similarity it is a good practice to move slightly this object over it's background between picture #1 and picture #2.
-This will artificially create a difference that will void usage of this transparency area, and is rather a simple and helpfull methode,
+Still keeping the same framing, this will artificially create a difference of the background of "see trough" transparent area, that automatically will be detected and void the usage of this transparent area. This rather a simple and helpful method,