The present invention relates to a method and system that allows input mammography images to be converted between domains. More particularly, the present invention relates to converting mammography images from the image style common to one manufacturer of imaging equipment to the image style common to another manufacturer of imaging equipment. Aspects and/or embodiments seek to provide a method of converting input images from the format output by one imaging device into the format normally output by another imaging device. The imaging devices may differ in their manufacturer, model or configuration such that they produce different styles of image, even if presented with the same raw input data, due to the image processing used in the imaging device(s).