Targeted display color volume specification via color remapping information (CRI) messaging

A method on a decoder to extract color volume information for a targeted display, the method executed on a processor, the method comprising:

• by apparatus comprising one or more data processors configured by software, one or more programmable logic devices, one or more logic circuits or a combination thereof:
• receiving a colour_remap_id messaging variable identifying color remapping information, wherein the colour_remap_id messaging variable comprises 32 bits;
• generating a first value based on bits 7:0 of the colour_remap_id messaging variable;
• checking whether the first value is a reserved value;
• if the first value is not the reserved value, then using the first value as an index to a look-up table to generate a first luminance value for a targeted display, otherwise
• generating a second value based on bits 31:9 in the colour_remap_id messaging variable;
• and
• generating the first luminance value for the targeted display based on the second value.