Providing 3d look-up table (lut) estimation for color gamut scalability

A video coding device, comprising:

• a processor configured to:
• receive a first video signal in a first color format and a second video signal in a second color format;
• identify a color conversion model for mapping colors in the first color format to corresponding colors in the second color format, the color conversion model comprising a plurality of vertices;
• identify a plurality of used vertices in the color conversion model that are referenced in converting the first video signal in the first color format to the second video signal in the second color format;
• estimate a plurality of color conversion model parameters for the plurality of used vertices;
• and
• estimate a plurality of color conversion model parameters for a plurality of unused vertices based on the plurality of color conversion model parameters for the used vertices.

A video coding method, comprising:

• receiving a first video signal in a first color format and a second video signal in a second color format;
• identifying a color conversion model for mapping colors in the first color format to corresponding colors in the second color format, the color conversion model comprising a plurality of vertices;
• identifying a plurality of used vertices in the color conversion model that are referenced in converting the first video signal in the first color format to the second video signal in the second color format;
• estimating a plurality of color conversion model parameters for the plurality of used vertices;
• and
• estimating a plurality of color conversion model parameters for a plurality of unused vertices based on the plurality of color conversion model parameters for the used vertices.