Tilman Holzhauer wrote: > I would like to know how the > measurments of the white patch is calculated into the 3 triplets for R, > G, B. Would it be possible to get that informacion? Hi, RGB is a device dependent space, so you can only convert from a color measurement if you know exactly what the behavior of that space is. If you have an ICC profile describing the space, then you can use something like icclu to convert a measurement to an RGB value. See <http://www.argyllcms.com/doc/icclu.html> Graeme Gill.