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Pixel lookup in multiple variably-sized hardware virtual colormaps in a computer video graphics system

  • US 5,025,249 A
  • Filed: 06/13/1988
  • Issued: 06/18/1991
  • Est. Priority Date: 06/13/1988
  • Status: Expired due to Term
First Claim
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1. A computer video graphics system for displaying pixel values in one or more windows on a monitor, comprising:

  • a. a physical color lookup table for storing one or more virtual color lookup tables for producing digital color values to be displayed on the monitor;

    b. a pixel value memory containing pixel values for indexing into one or more virtual color lookup tables;

    c. means for providing a window number corresponding to each pixel value in the pixel value memory;

    d. a base value lookup table having a base value for each window, said base value lookup table having means for allowing access to said base value lookup table by using said window numbers as indices into said base value lookup table; and

    e. adders for adding pixel values to the base value from the base value lookup table thereby to produce indices into the physical color lookup table.

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