Picture data memory system for storing both black and white and color picture data with different resolutions

Abstract From the Canadian patent

A picture data memory system includes a page memory for storing both color gradation and black/white concentration data of a picture to be processed. A color scanner produces either color gradation data or black/white concentration data of a draft picture scanned thereby. Since the resolution of color picture data can be much lower than the resolution of black and white picture data, color picture data is scanned at a resolution of 3 lines/mm while a black and white picture is scanned at a resolution of 12 lines/mm. The number of bits of color gradation data and black and white concentration data written into each address of the page memory are set to be equal to each other so that 4, …