Patent ID: 8081194

Claim:
A method for enhancing colour resolution of an original image presented on a display, comprising the steps of: using a control unit decoding the original image by means of an error diffusion dithering algorithm having the capacity of producing diffused slow gradients; storing the decoded image in a system frame buffer having a fixed first number of bits per pixel; wherein the original image has a number of levels of colour resolution; and wherein the method further comprises the steps of: processing pixel values of said decoded image to recreate slow gradients in the original image to produce more levels of colour resolution than the number of levels of colour resolution of the original image, wherein the processing step involves averaging pixel values of a two-dimensional neighbourhood of pixels surrounding the pixel whose pixel value is being processed; producing an increased second number of bits per pixel, said second number of bits per pixel being adapted to characteristics of the display; and using processing logic sending processed pixel values to the display using said second number of bits per pixel.