Digital halftoning is to quantize a continuous-tone image to a binary image or a color image with limited colors that the output halftoned image looks like the original multitone image when viewed from a distance.

• 图像半色调技术是指用少量的色彩将一幅连续色调图像(如灰度图像和彩色图像)量化为一幅二值图像或是只有少数几种色彩的彩色图像,并且量化后图像在一定距离的视觉效果和原始图像相似的技术。