1. A system for converting input image data in a first color space to output image data in a second color space, wherein said second color space comprises an RGBW format, said system comprising: a converter for calculating chroma/luma values and calculating hue angle of said input image data from a first color space; a hue angle triangle calculator, said hue angle triangle calculator determines in which chromaticity triangle the input data resides; a matrix multiply unit, said unit multiplying the input data with a conversion matrix selected depending upon the chromaticity triangle determination.