Facsimile and static presentation processing – Natural color facsimile – Color correction
Patent
1993-01-08
1994-01-11
Coles, Sr., Edward L.
Facsimile and static presentation processing
Natural color facsimile
Color correction
358525, 358534, 345149, G03F 308
Patent
active
052786781
ABSTRACT:
A scheme for the color display of images on a device with a moderate sized color table first builds halftoned binary images for each of the three color components at a multiple of the display resolution. By summing bit values it then determines average values for display resolution pixels. The average values are then mapped to a color table. An example of the scheme uses the YES color model as the color coordinates. The colors are separated into luminance and chrominance components, allowing more weight to be given to the luminance from which the eye extracts most of the information. An example of the scheme yields 275 real colors for a 17.times.9 .times.9 grid of coordinate values, which is close to the size of a 256 entry color table. The scheme provides both anti-aliasing of solid areas, such as lines and text, and color halftoning to give the appearance of colors between those available from the color table. The color table may be constructed to include color coordinate transformations and gamma correction.
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Coles Sr. Edward L.
Stoll Thomas L.
Xerox Corporation
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