1. A method for processing a digital video stream of color images, each color image comprising three color components in a first RGB format, the method comprising: transforming, by processing circuitry, color components of each color image into three color components of a second RGB format based on the three color components of the first RGB format and three parameters each representing variations in luminosity in one of the three color components of the second RGB format caused by a processing system comprising at least one of a video processor, a display processing unit, and display driver electronics in a display device, the second RGB format for displaying images formed of macropixels using at least four colors by activating at least four subpixels within each macropixel, each macropixel selectably addressable by two row control signals for the respective macropixel and at least two column control signals for a respective macropixel, the three color components for each image being transformed based on: 
 CR=f 1 ( R,G,B,Δ 1 ), 
 CG=f 2 ( R,G,B,Δ 2 ), and 
 CB=f 3 ( R,G,B,Δ 3 ) wherein CR, CG and CB are the transformed RGB components, f 1 , f 2 , and f 3 are the functions for transformation into the second RGB format for each RGB component, R, G and B are the three color components according to the first RGB format, and Δ 1 , Δ 2 and Δ 3 are the three image color distortion parameters representing variations in luminosity caused by technical characteristics of the processing system, for each transformed component of the image; and during the transformation of the color components, adapting the three color components of the image using the three image color distortion parameters to at least four color components.