Color editing with simple encoded images

Details Color editing with simple encoded images Color editing with simple encoded images

1991-12-09

1993-04-20

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340701, 358 80, G09G 128

Patent

active

052046656

ABSTRACT:
In an original image in red, green, blue color space (RGB) defined by a large number of colors, color variety of the original image is accomplished by displaying a reduced representative color set. The reduced representative color set is produced by initially treating each color separation individually, to reduce the number of levels defining the image, in a manner which retains much of the image information. Subsequently, the separations are combined into an index into color set in a look up table (LUT) having between about 27 and 120 RGB triplets. Each RGB triplet defined by one of the LUT triplets is converted to a luminance/chrominance value. Modifications are made to the image in luminance/chrominance, and converted back to RGB space to reload the LUT for real time color variation of the image. Upon establishing a desirable color set in luminance/chrominance space, the luminance/chrominance values selected, which define the new position of the image in luminance/chrominance space, are used to change the colors in the original in a single step. The new original image is then again displayed with a new reduced representative color set derived in the same manner as described.

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Floyd et al "An Adaptive Algorithm for Spatial Grayscale", pp. 75-77, 1976.

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