It provides a few options to get exactly what you need, see Usage. The Python script that operates the conversion also converts from the Munsell color system to sRGB colors in hex format.
The original colors that could not be directly expressed in the sRGB space, they were mapped to the closest color. The provided JSON file munsell.json, contains all the colors from the 1943 renotation data, including Munsell and xyY coordinates, as well as the corresponding sRGB colors in hex format. Table 6.2 shows the algorithm of the conversion from RGM to HIS and from HIS to RGB with the range of H (0, 60), I (0, 1) and S (0, 1) R (0, 1), G (0, 1), B (0, 1) for the hexagon color space, where H = 0 or 60 (Red), H = 10 (Yellow), H = 20 (Green), H = 30 (Cyan), H = 40 (Blue), H= 50 (Magenta).This repository contains the Munsell renotation data from 1943, as provided by the Rochester Institute of Technology, converted into JSON format. When users want to change the brightness or intensity of a certain color, it would be really difficult to change RGB combination directly, but it is very easy to change only I of HIS if RGB is converted to HIS.Ĭolor conversation between RGB and HIS is physically established, though there are several HIS color space systems such as cube, cone, hexagon and double hexagon color space, which are a little different from the Munsell color system.įigure 6.6 show the relationship between RGB and HIS color space. The Munsell color samples are available in the commercial market or publications.
Any color in the Munsell color system is identified with a combination of HIS, for example 2.5 R 6/4, that is 2.5R (H), 6(I) and 4(S). The Munsell color system as shown in Figure 6.5 consists of a hue ring with forty colors 11 intensity levels, from 0 (black) to 10 (white) and saturation ranging differently from low (mixed 0~2) to high (pure 10~20) depending on the hue and intensity.
While color output by computer is based on three primary colors of red (R), green (G) and blue (B) and their mixture depending on bits or gray scale, human visual sense of color will rely on hue (H), intensity (I) and color purity or saturation (S), the relationship that has been already established with the Munsell color system, one of the most popular color appearance systems in the world.
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