The Munsell and Ostwald color systems match colors to a set of standard samples. The Munsell system divides hue into 100 equal divisions around a color circle. This is similar in approach to the Newton Color Circle except that the circle is distorted by assigning a unit of radial distance to each perceptable difference in saturation (called units of chroma). Since there are more perceptable differences for some hues, the figure will bulge outward to 18 values for some hues compared to only 10 for another. Perpendicular to the plane formed by hue and saturation is the brightness scale divided into a scale of "value" from 0 (black) to 10 (white). A point in the color space so defined is specified by hue, value, and chroma in the form H V/C.

The MUNSELL system is a collection of color samples for comparison, with adjacent samples based upon equal perceived differences in color.

Some features of the Munsell system are used in commercially available paint and pigment mixing guides like the Color Wheel.

The Ostwald and Munsell color systems match colors to a set of standard samples. The Ostwald system creates a color space based on dominant wavelength, purity, and luminance, mapping the values of hue, saturation and brightness. Establishing the values for these parameters is done with a disc colorimeter whch mixes on a disk amounts of the pure spectral color at the dominant wavelength with white, and black . Thus the point in the Ostwald color space is represented by values C,W, and B to represent the percentages of the circle. For example 35,15,50 represents 35% full color, 15% white, and 50% black.

The OSTWALD system is based upon an analysis of reflectance curves.

Comparison of Munsell & Ostwald