Method and apparatus for making monochrome facsimiles of color images on color displays

Apparatus for generating a monochrome raster scan graphic image of a polychrome raster scan image created on the face of a polychrome CRT comprising

• storage means for storing multiple sets of color signals for energizing different color regions in color pixels arranged in a plurality of rows at the face of the CRT for emitting different colors of light when energized by an electron beam to create a polychrome raster scan image on the face of the CRT,
• generator means for generating multiple sets on screen signals corresponding to the multiple sets of color signals for creating different pattens in areas in the monochrome raster scan graphic image that correspond to different color areas in the polychrome raster scan image,
• microprocessor means for combining the color signals and screen signals to generate a single set of marking signals representative of a raster image having monochrome pixels corresponding to the color pixels at the face of the CRT and
• printing means coupled to receive the marking signals to generate visible monochrome marks on a graphic medium to form a monochrome raster scan graphic image wherein different patterns associated with the screen signals represent colors in the polychrome raster scan image at the face of the CRT.