Mapping colors of an image

A non-transitory computer readable storage medium tangibly embodying a computer readable program code having computer readable instructions which when implemented, cause a computer to carry out the steps of a method comprising the steps of:

• segmenting an image into a plurality of regions, so that pixels in each of said plurality of regions have a characteristic that meets a predetermined similarity;
• determining an initial contrast between adjacent regions in said plurality of regions by determining an initial color of a representative point of each of the adjacent regions as said initial colors Cl and C2 and calculating a difference between said initial colors Cl and C2 and an initial color C3 of a border between the adjacent regions in order to determine said initial contrast, wherein determining the initial contrast between adjacent regions in said plurality of regions further comprises:
• merging at least one of said initial contrasts for adjacent regions having the same initial color;
• and
• removing redundant initial contrasts between each of said plurality of regions and its said adjacent regions that have the same initial color;
• and
• transforming the initial colors C1, C2 and C3 into a target color C1′, C2′ and C3′, respectively;
• wherein said target color is selected such that a target contrast between said adjacent regions in said plurality of regions is equal to or greater than said initial contrast and a difference between said target contrast and corresponding initial contrast is less than a predetermined threshold and such that (C1-C3)/(C2-C3) equals (C1′-C3′)/ C2′-C3′);
• and
• wherein at least one of the steps is carried out by a computer device.