Method and device for generating a second image from a first image

A device for generating a second image from a first image,

• the device comprising:
• one or more processors, and at least one memory, wherein the one or more processors is configured to color gamut map said first image to generate said second image, the content of said second image corresponding to the content of said first image but the color space of said second image is different from the color space of said first image, said color gamut mapping being controlled by a color gamut mapping mode obtained from a bitstream, and said color gamut mapping mode belonging to a set comprising at least two preset modes and an explicit parameters mode;
• and
• wherein the one or more processors is configured to determine a substitute color gamut mapping mode from additional data in case said obtained color gamut mapping mode is the explicit parameters mode and in case said processor is not enabled for gamut mapping with the explicit parameters mode, the color gamut mapping being controlled by said substitute color gamut mapping mode.