Chroma reshaping based on just noticeable differences

A method comprising:

• receiving, by a computer, at least one image or video frame;
• for a color space of the at least one image or video frame, partitioning, by the computer, the color space in M1×M2×M3 non-overlapping bins;
• determining for each bin whether it is a valid bin, a valid bin being a bin for which the at least one image or video frame has at least one pixel with a color value falling within said bin;
• for each chroma channel of the color space:
• calculating, by the computer and for each valid bin, a required number of codewords necessary for the respective chroma channel to represent, without a noticeable difference, two color values in said valid bin that have consecutive codewords for the respective chroma channel;
• generating, by the computer, at least one content-aware chroma forward reshaping function, based on the calculated required numbers of codewords;
• applying, by the computer, the at least one content-aware chroma forward reshaping function to the at least one image or video frame.