HP Labs Technical Reports
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Arad, Nur; Shaked, Doron; Baharav, Zachi; Lin, Qian
Keyword(s): color halftoning; dithering; barycentric coordinates
Abstract: Monochrome dither halftoning is a gray-scale image rendering procedure where gray-levels in an image are compared against a periodic threshold array, placing a Black dot in every location whose gray-level is smaller than the corresponding threshold value. Current generalizations to color printing result in Cartesian thresholding procedures, namely RGB values are compared component-wise to trivariate thresholds. In this report we develop a color dithering procedure based on a non-Cartesian coordinate system. Its main advantage over the traditional Cartesian thresholding is that it allows the rendition of solid color patches while using no more than a preselected quadruple of colors, thereby enabling a reduction of halftone noise.
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