Abstract
At present inserting color images into articles or reports is too expensive. It is useful if the color image can be converted automatically to monochromatic image on the CRT screen. Therefore, an algorithm for converting a color image to a monochromatic image with the hatch on the CRT display has been developed. This paper reports the conversion algorithm and program written in C language. This converted monochromatic image can be made into a hard copy with an dot-impact printer, and this image can be inserted into articles or reports.