Color correction

A method of digital image processing for applying pixel-based color correction to an input image of a digital image processing device to generate an output image, said method comprising the steps of:

• providing two or more color correction processes of the digital image processing device each having a respective associated locus in a color space and a respective associated color mapping operation;
• arranging said color correction processes of the digital image processing device as a succession of processes so that results of a color correction process form an input to a next such process in said succession;
• and
• detecting, in each color correction process of the digital image processing device, whether each pixel lies within said respective locus in color space and, if so, to apply said color mapping operation to the pixel,
• wherein once a first color correction process is performed by the digital image processing device on a particular pixel, each additional color correction process of said two or more color correction processes with respect to the particular pixel is limited to an extent dependent on a degree by which previous color correction processes in the sequence were applied thereby inhibiting color mapping in respect of loci associated with the previous color correction processes in the sequence.

A computer readable storage medium encoded with instructions, which when executed by a computer causes the computer to execute a method comprising:

• providing two or more color correction processes each having a respective associated locus in a color space and a respective associated color mapping operation;
• arranging said color correction processes being as a succession of processes so that results of a color correction process form an input to a next such process in said succession;
• detecting, in each color correction process, whether each pixel lies within said respective locus in color space and, if so, to apply said color mapping operation to the pixel,
• wherein once a first color correction process is performed on a particular pixel, each additional color correction process of said two or more color correction processes with respect to the particular pixel is limited to an extent dependent on a degree by which previous color correction processes were applied thereby inhibiting color mapping in respect of loci associated with the previous color correction processes in the sequence.