Patent ID: 6637851
Filing Date: 2003-10-28
Classification: H04N

Abstract:
A method for reproducing on an output device an electronic image having colour pixels, each colour pixel being represented by K spatially corresponding component pixels, K>1, each component pixel having an input pixel value, the output device being capable of rendering Nj intensity levels for a component pixel j, 1&lE;j&lE;K, thereby defining N1*N2* . . . *NK intensity level combinations, the method comprising the steps of:computing for any colour pixel a scalar value which is a function of at least one of said input pixel values of said spatially corresponding component pixels; quantizing said scalar value by a multilevel halftoning process to obtain for said colour pixel a quantized scalar value; using said quantized scalar value to select, out of all said intensity level combinations, a subset of intensity level combinations; selecting one combination out of said subset; using said selected combination for reproducing said colour pixel by said output device.