HP Designjet 5500 HP Designjet 5500 series - User Guide - Page 211
error-diffusion screening
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error-diffusion screening hp designjet 5500 series welcome how do I ... tell me about ... the problem is ... legal notices glossary index error-diffusion screening Conventional printing uses images whose tonality is created by variable-size dots (at fixed positions) called halftone dots. The HP Designjet printer uses a different method for creating tonality, with same-sized dots at randomized positions, called error diffusion. Error-diffusion patterns are generated by the printer's internal circuitry. The benefit of error-diffusion printing is that the machine appears to generate 'continuous-tone' images while it is creating error-diffusion halftone images. If you look at a Designjet proof through a magnifier, you will see these errordiffusion patterns. When properly calibrated, and when using an appropriate color management profile for the printer and printing material, an HP Designjet printer can match a print from a printing press or photographic process. The original image is free of tonal patterns -- it is called a continuous-tone image. file:///C|/Documents%20and%20Settings/---/Desktop/HP/html/C000-72.htm (1 of 2) [8/5/2002 2:23:33 PM]