User’s Manual39Fixed Processing: Used for black-and-white and other high contrast documents. Asingle level is set to determine the black-and-white transition. The threshold isprogrammable over the entire densityrange. Fixed Processing sets Contrast to0. If Fixed Processing is selected,Contrast is not available.Halftone: In addition to the black andwhite display, Halftone can present asomehow gray shade of image by usingdifferent size of dots. Halftone image lookslike the picture we have seen in thenewspaper. Options include Halftone 1,Halftone 2, Halftone 3, Halftone 4,Halftone 5.Error Diffusion: Error Diffusion is a typeof Halftone. Error Diffusion gives goodimage texture and makes text in imagesmore readable than Halftone.Halftone Image