The Hunter Rdab opponent-color scale, developed in 1943, was an early version of the Hunter L, a, b scale.
Instead of L, Rd is used to designate lightness and is identical to the CIE Y Brightness/Luminosity value. Sometimes the Rd, a, b color scale is shown as LRd, aRd, bRd. Continue reading
Mr. Philips has spent the last 30 years in product development and management, technical sales, marketing, and business development in several industries. Today, he is the global market development manager for HunterLab, focused on understanding customer needs, providing appropriate solutions and education, and helping to solve customer color challenges across these industries and cultures.