METHODS TO PRINT N-TONE IMAGES WITH MULTI-LEVELING TECHNIQUES

Generating a N-tone image from a grey scale image with a number of multi-level dither matrices. Both images have many pixels, with each pixel in the grey scale image having a grey level that is within a maximum and a minimum levels, and with each pixel in the N-tone image having a level that is one of N levels with N bigger than two. The method includes the step of determining the level of each pixel in the N-tone image based on the levels of its corresponding pixel in the grey scale image, and an original dither matrix, the separations between adjacent levels in the N levels are not uniform. After the determination process, every pixel in the N-tone image is modelled to represent its level. Based on the modelling, the N-tone image is printed.