Abstract: Provided is a method for sharpening an image, said image comprising a plurality of pixels, each pixel having at least a first value for a first color channel and a second value for a second color channel, the method comprising: selecting a first pixel; calculating an average projection of vectors defined by first values and second values of pixels in a region surrounding said first pixel onto a first vector, said first vector defined by said first value and said second value of said first pixel; adjusting said first value and said second value of said first pixel using said average projection.

Abstract: Provided is a method of obtaining a monochrome image from a color image, said color image comprising a plurality of color pixels, and having at least two color channels, each pixel of said plurality of color pixels comprising a value for each color channel of said at least two color channels, said monochrome image comprising a plurality of monochrome pixels, each monochrome pixel having a value for a monochrome channel, the method comprising: calculating a local weighting factor for each color channel of each pixel of said color image; calculating said value of said monochrome channel for each pixel as a sum over said at least three color channels of products of said local weighting factor and said value for each color channel.