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Graphics Interchange Format  |  1997-04-17  |  37KB  |  453x220  |  4-bit (16 colors)
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OCR: (a) (b) Gouraud-shaded Gouraud shaded value at contor = 1 value at center = 0 Figure 2: Gouraud shading varies with polygon screen orientation. (a) Rotated 0 degrees; (b) rotated 90 degrees.