Image reading system with colour corrected light source based on human vision characteristics

摘要

An imaging system 100 scans a colour original and provides a signal 161 with limited chromaticity for use by a print engine 172 or a display 178. A light source 116 simultaneously illuminates the original with primary colour intensities, for example, 21% red, 72% green, and 7% blue. The colour proportions are determined with reference to human visual characteristics. Sensor 120 integrates the reflected intensities to provide a luminance signal 125. Matrix multiplication to convert to luminance is avoided. In a variation, illumination is provided with 6/19 red, 9/19 green, and 4/19 blue to provide a gray scale image of, for example, business graphics.