Abstract

Formulas expressing colorimetric purity in terms of given trilinear coördinates have been independently derived by Ives and Priest. This paper gives (1) the derivation of still another form of purity formula; (2) a discussion of the computational methods which are, at once, accurate and speedy, together with an analysis of the various formulas with regard to convenience for routine computing; (3) the extension of the new formulas to purity for purples; and, (4) a general solution for the trilinear coördinates (r,g,b) of a color of purity, p, in terms of the coördinates (R,G,B) of the spectrum and the luminosity coefficients (L_r, L_g, L_b).

© 1926 Optical Society of America

The Computation of Colorimetric Purity IIApplication of the Purity Formula to Non-Spectral Colors*

Irwin G. Priest
J. Opt. Soc. Am. 13(2) 123-132 (1926)

A General Formula for The Computation Of Colorimetric Purity*

Deane B. Judd
J. Opt. Soc. Am. 21(11) 729-747 (1931)

The Computation of Colorimetric Purity*

Irwin G. Priest, L. B. Tuckerman, Herbert E. Ives, and F. K. Harris
J. Opt. Soc. Am. 9(5) 503-520 (1924)

CHROMATICITY SENSIBILITY TO STIMULUS DIFFERENCES

DEANE B. JUDD
J. Opt. Soc. Am. 22(2) 72-72 (1932)

The Minimum Perceptible Colorimetric Purity as a Function of Dominant Wave-Length*

Irwin G. Priest and F. G. Brickwedde
J. Opt. Soc. Am. 28(5) 133-139 (1938)