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Graphics Interchange Format  |  1997-01-13  |  62.4 KB  |  500x455  |  4-bit (14 colors)
   ocr: FIGURE 6 Exponential filter. 1 i 100 k H(2):= z0=e2i-f GI(): : H(Z(1)) 1-(1-kz 0.8 0.6 GI(Fff) G(F-ff, 100) 0.4 0.2 J acu 0.1 10 100 1000 F