Apparatus for outputting an image in which data of points on texture pattern are mapped to data of dots on display plane

An apparatus for outputting an image in which picture data of points on a texture pattern are mapped to picture data of dots on a display plane, said apparatus comprising:

• a map memory for storing a texture map in which a plurality of predetermined RGB colors of all pixels on the texture pattern are defined, each of the predetermined RGB colors being read from said map memory when an address of said map memory indicating a pixel on the texture pattern is input;
• storing means for storing at least a pair of control values including a control RGB color value and a corresponding control luminance value;
• a comparator for comparing the control RGB color value from said storing means with a predetermined RGB color read from said map memory for determining whether the predetermined RGB color read from said map memory is the same as a specified RGB color indicated by the control RGB color value output from said storing means;
• and
• a selector for selectively outputting either an original luminance or a changed luminance indicated by the control luminance value output from said storing means, in accordance with a result of said comparison by said comparator, said selecting means outputting the control luminance value only when a predetermined RGB color is detected to be exactly the same as the control RGB color value, said storing means, comparator and selector being discrete components which together perform pipeline processing for selectively modifying a luminance value.