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Graphics Interchange Format  |  2000-03-31  |  21.5 KB  |  244x276  |  4-bit (16 colors)
   ocr: Figure 3: Ihe - unsbarp mask is tbe aifference between the test data ana a blurred version o . thar data. In this case, lused a Gaussan Blur witba radius of . two, and subtracted the blurred: version ofFigure 21rom the original.