1. A method of converting a color image to a gray image and/or a black and white image, the method comprising, simultaneously: detecting the amount of chroma in an input image; computing conversion to gray and/or black and white of the input image; and converting a plurality of elements of an input image into International Color Consortium Profile Connection Space (ICC PCS); wherein the detection of the amount of chroma in an input image comprises detecting the amount of chroma of each element of the converted image; and wherein the computation of the conversion to gray and/or black and white comprises computing conversion to gray and/or black and white of the converted image.