Description: Subtraction law of the source. To be noted is, a document of the plan called c : \ test.bmp, second graph in the paper were c : \ backgnd.bmp. They share the same values and gray palette. When implemented, these two documents have been prepared. Our target is worth two plans, but in order to facilitate the use of 256 grayscale. But only uses two 0 and 255 gray levels.
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