1. A method of generating a grayscale image, the method comprising receiving a single value through a user interface control; from the single value, computing a plurality of different grayscale weighting values for converting a color image to the grayscale image, wherein different settings for the single value result in different proportionalities of each of the grayscale weighting values to each of the other grayscale weighting values; and generating the grayscale image by applying the plurality of different grayscale weighting values to the color image, wherein said receiving, computing and generating are performed by an electronic device.