mp4-colr

class ColourInformationBox extends Box(‘colr’){
   unsigned int(32) colour_type;
   if (colour_type == ‘nclx’) /* on-screen colours */
   {
      unsigned int(16) colour_primaries;
      unsigned int(16) transfer_characteristics;
      unsigned int(16) matrix_coefficients;
      unsigned int(1) full_range_flag;
      unsigned int(7) reserved = 0;
   }
   else if (colour_type == ‘rICC’)
   {
      ICC_profile;   // restricted ICC profile
   }
   else if (colour_type == ‘prof’)
   {
      ICC_profile;   // unrestricted ICC profile
   }
}
colour_type: an indication of the type of colour information supplied. For colour_type ‘nclx’:
   these fields are exactly the four bytes defined for PTM_COLOR_INFO( ) in A.7.2 of ISO/IEC 29199-2
   but note that the full range flag is here in a different bit position
ICC_profile: an ICC profile as defined in ISO 15076-1 or ICC.1:2010 is supplied.