Convert RGB (red-green-blue) colours to RYB (red-yellow-blue) colours, and vice versa. Algorithm based on Sugita and Takahashi (2015, 2017)
RGB2RYB(RGBmat)
RYB2RGB(RYBmat)Matrix of RGB or RYB primary colour intensities, where rows are records and columns are primary colours.
numeric -- matrix of red-green-blue primary colors by column, where rows are individual records of the three primary (RGB) colours. User can specify RGB in terms of 0-1 or 0-255; however, the algorith converts the latter to 0-1.
numeric -- matrix of red-yellow-blue primary colors by column, where rows are individual records of the three primary (RYB) colours. User can specify RYB in terms of 0-1 or 0-255; however, the algorith converts the latter to 0-1.
Rowan Haigh, Program Head -- Offshore Rockfish
Pacific Biological Station (PBS), Fisheries & Oceans Canada (DFO), Nanaimo BC
locus opus: Regional Headquarters, Vancouver BC
Last modified Rd: 2022-07-06
The RYB colour wheel is more commonly used by artists, and provides a more intuitive system when blending colours -- red and yellow makes orange, yellow and blue makes green, blue and red makes purple. On the RYB colour wheel, red lies opposite green, but on the RGB colour wheel, red lies opposite cyan.
Sugita, J. and Takahashi, T. (2017) Computational RYB Color Model and its Applications. IIEEJ Transactions on Image Electronics and Visual Computing 5(2): 110-122.
Sugita, J. and Takahashi, T. (2015) RYB Color Compositing. International Workshop on Applications in Information Technology, October 8-10, 2015.