Description: "Embossed" image effect refers to the foreground of the image to the convex background. Concept of the so-called "relief" is the index on the drawing as a pixel and its upper left is the difference between the pixel value of a process, in order to keep the image brightness and gray, I for this difference in processing constant with a value of 128. Need the reader to pay attention, is when setting a pixel value, it and its upper left of the pixel to be used, in order to avoid the use has been set of pixels, should start from and to the right of the image pixel processing, is to realize the source code below:
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