Run length compression format for storing raster data in a cache

摘要

A run length compression technique, that raster image processes page elements into a plurality of groups of raster data and analyzes the groups of raster data for a predetermined set of parameters. An assignment of compression states is made in accordance with results of the analysis for characteristics of transparency, constancy of a value for the groups of raster data, or features within the groups that should not be compressed. <IMAGE>