1. A method for sharpening colours in an image comprising at least a first and a second colour component, the pixels comprising information of the first colour component being located at least partly in locations different from the pixels comprising information of the second colour component, in which method said first colour component and said second colour component are interpolated, and at least said first colour component is sharpened, wherein the sharpening of said second colour component is controlled on the basis of the sharpening of said first colour component.