error-diffusion screening
hp designjet
5500 series
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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 error-
diffusion 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.
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