additive process
n (Photography) a photographic process in which the desired colours are produced by adding together appropriate proportions of three primary colours. Compare
subtractive process Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014