Method and apparatus for generating small, optimized color look-

Details Method and apparatus for generating small, optimized color look- Method and apparatus for generating small, optimized color look-

1997-03-28

2000-01-04

Saras, Steven J.

Computer graphics processing and selective visual display system

Display peripheral interface input device

345199, 345431, 382167, G09G 502

Patent

active

060115408

ABSTRACT:
In a computer graphics windowing system including a color map, a method for managing palette color value contents of the color map. Input color values are received. Error values between each input color value and each palette color value are used to determine a closest palette color value to each input color value. A list of input color values having largest error value distances to their respective closest palette color values is determined. A subset of this list is added to the color map to derive a modified color map. A color value metric process for determining an error value between each input color value and each palette color value comprises converting each input color value and each palette color value to a uniform color space. A lightness weighting constant is used to skew the error value in to be more strongly influenced by differences in lightness than by differences in chromaticity. A look up table having address spaces indexed by RGB index color values is generated. Each address space of the look up table is filled with a color map address of the closest palette color value to the respective RGB index color value referencing the address space.

REFERENCES:
patent: 5365252 (1994-11-01), Lo
patent: 5692071 (1997-11-01), Govaert
Apple Computer Inc., Technical Introduction to the Macintosh Family, Second Edition, pp. 200-204.

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