Abstract: A computerized device for converting a color image data, indicative of a plurality of color image regions defining a two-dimensional color image, into a grayscale image data indicative of a plurality of grayscale image regions defining a two-dimensional grayscale image, with each of the color image regions corresponding to one of the grayscale image regions. A luminance information and a two-dimensional chromatic information is associated with each of the color image regions. The device includes a processor and a memory store. The memory store is adapted to store a program executable by the processor so as to perform the following steps: determining a principal chromatic component of each of the color image regions; determining a first correlation value; and generating the grayscale image data by reference to the first correlation value.

Abstract: A computerised device for converting a colour image data indicative of a plurality of colour image regions defining a two-dimensional colour image, into a grayscale image data indicative of a plurality of grayscale image regions defining a two-dimensional grayscale image, each of the colour image regions corresponding to one of the grayscale image regions, and wherein a luminance information and a two-dimensional chromatic information is associated with each of the colour image regions, wherein the device includes a processor and a memory store, said memory store being adapted to store a program executable by the processor so as to perform the following method steps: (i) determining a principal chromatic component of each of the colour image regions by reference to the two-dimensional chromatic information associated with each of the colour image regions; (ii) determining a first correlation value indicative of a correlation between the collective principal chromatic components of the colour image regions an