convert color image to black and white is a technique for converting images into black and white. There are just several... moreconvert color image to black and white is a technique for converting images into black and white. There are just several shades of gray remaining once all color information has been stripped, with black being the deepest and white being the lightest. The brightness levels of its intermediate hues are typically the same for the three major colors: red, blue, and green. Each pixel represents an image's luminous intensity.