Hewlett-packard Company

Thomas M Sternberg

Douglas G Keithley

Paul L Jeran

Eric L Andersen

Curt Nelson Van Lydegraf

An imaging system scans a color original and provides a signal with limited chromaticity for use by a print engine or a display. A light source illuminates the original with primary color intensities, for example 21% red, 72% green, and 7% blue. A sensor integrates the reflected intensities to provide a luminance signal. 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. Such an image has distinguishable variation for colors of equal lightness (L*).

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Boise, ID, United States of America

Thomas M Sternberg