Barycentric Screening

Arad, Nur ; Shaked, Doron ; Baharav, Zachi ; Lin, Qian

HP Development Company

关键词: color halftoning;    dithering;    barycentric coordinates;   

RP-ID  :  HPL-97-103R1

学科分类：计算机科学（综合）

美国|英语

来源: HP Labs

【 摘 要 】

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.Disclaimer: We are not responsible for the quality of the color images. To get the desired result, try to print the report on an HP inkjet 1600 using HP premium paper only.Contact Doron Shaked [e-mail] for hardcopies of the images in this technical report. 23 Pages