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Proceedings Paper

Adaptive color error diffusion to improve halftone smoothness
Author(s): Joseph Shou-Pyng Shu; Jack D. Boyce
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Paper Abstract

An adaptive error diffusion technique for color ink jet printing has been developed to improve halftone smoothness and quality. The technique makes the output color dot distribution smoothly spread apart each other. This reduces color interference noises. In addition, it increases frequency at light tones to result better visual quality. Threshold values for different color plans are determined adaptively depending on the color values and their accumulated errors. For a given CMY(K) color input pixel, the CMY(K) values are summed with errors which were diffused from previously-processed neighboring pixels. The summed CMY(K) values suggest the priority of turning 'ON' colors. Threshold values for CMY(K) are, therefore, ranked and assigned by different values. When we change a threshold value in a single color channel, visually it does not change output tones. This characteristic makes the adaptive threshold result same tones but more smooth dot distribution. In addition, the reduction of printer mechanical registration errors is discussed by the presented error diffusion. It achieves overall quality improvement. Experimental results are provided to show the effectiveness of the technique.

Paper Details

Date Published: 4 April 1997
PDF: 8 pages
Proc. SPIE 3018, Color Imaging: Device-Independent Color, Color Hard Copy, and Graphic Arts II, (4 April 1997); doi: 10.1117/12.271607
Show Author Affiliations
Joseph Shou-Pyng Shu, Epson Palo Alto Lab. (United States)
Jack D. Boyce, Univ. of California/Berkeley (United States)

Published in SPIE Proceedings Vol. 3018:
Color Imaging: Device-Independent Color, Color Hard Copy, and Graphic Arts II
Giordano B. Beretta; Reiner Eschbach, Editor(s)

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