Subtraction of the source program. Note that, the first picture file named C : \ test.bmp, second picture file name is C: \ backgnd.bmp. They have the same gray scale value and palette. When executed, the two documents are ready. We although aimed at value of two plans, but in order to facilitate the, use of 256 grayscale, but to only 0and 255of two kinds of gray level.

MainFrm.cpp

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