COLOR DIGITAL HALF-TONING TAKING COLORIMETRIC COLOR REPRODUCTION INTOACCOUNT

Taking colorimetric color reproduction into account the conventional e rror diffusion method is modified for color digital halftoning. Assumi ng that the input to a bilevel color printer is given in CIE-XYZ trist imulus values or CIE-LAB values instead of the more conventional RGB o r YMC values, two modified Versions based on vector operation in (1) t he XYZ color space and (2) the LAB color space were tested. Experiment al results show that the modified methods, especially the method using the LAB color space, resulted in better color reproduction performanc e than the conventional methods. Spatial artifacts that appear in the modified methods are presented and analyzed. It is also shown that the modified method (2) with a thresholding technique achieves a good spa tial image quality. (C) 1996 SPIE and IS&T.