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#Rgb to munsell converter code#
I regret to inform that so far I have only written code for the conversion that goes the opposite direction from what the OP requested (a year ago, as I type this). It agrees with the numbers for the Color Checker card almost exactly. I wrote an interpolator based on the old renotation data. The only numbers I know of that they publish are the D50 Lab and D65 sRGB numbers for a small set of colors on their "Color Checker" cards. I imagine they have voluminous data related to the color-chips they sell. The Munsell authority today is a company called Gretag Macbeth. Others surely exist, but they are closely held secrets. That data-set, called the "Munsell Renotation Data," is the only one that is freely available. One of the things they did was to take a standard Munsell Book of Color, shine illuminant-C light on the colored chips in the book, and record the data in xyY format. In the 1930's, color scientists were developing the mathematical models. But C plays a key role in the answer to the question. C was the light from a standard lighting fixture that was relatively inexpensive to build in the 1930's. The xyY numbers might be relative to D50, or they might be relative to an old standard called C. The Lab numbers listed by the OP are probably relative to D50, which is more like afternoon or morning light. D65 is something like a cloudless day at noon. (Rough but simple approximations can be done using the "Bradford matrices.") The RGB that we use is by default "sRGB," which specifies an illuminant called D65. Chromatic adaptation for illuminants in the mathematical model is computationally difficult. More on that in the footnote.ĬIE xyY, L ab*, and RGB mean nothing unless an illuminant is specified. 5RP, will appear to the typical human with normal eyesight to be the same hue. A sky-blue and a powder-blue that Munsell assigns the same hue notation, e.g. Munsell codes also preserve perceived hue at different chromas. It still looks white! Munsell tapped into that astonishing processing power empirically.
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Take it indoors and look at it under incandescent (yellowish) lights. Take a piece of typing paper outside under a blue sky. Another google-term is "chromatic adaptation." Chromatic adaptation in the brain is automatic if the lighting is not too weird. Munsell describes the colors of objects as they are perceived under a wide variety of illuminants. Some google-terms are "illuminant," "tri-stimulus," and "CIE standard observer." xyY, L ab*, and RGB, describe light that has bounced off an object and passed through a convolultion with a rather simple mathematical model of a human eye. (Isaac Newton was the first to realize that color is in the eye of the beholder.) Munsell conducted extensive experiments with human subjects and ingenious devices. Munsell notation describes the color of an object - what people experience when they view the object. Munsell codes are different in kind than those other codes, xyY, Lab, and RGB.
#Rgb to munsell converter free#
Free or inexpensive programs that I have found on the net have proved to be flawed. The only data set that is publicly available was collected in the 1930's. The short answer is, converting Munsell codes into RGB involves interpolation of empirical data in 3D that is highly non-linear. So can anyone convert Munsell HVC to HSB or HSL, or better yet, RGB? or even higher - which makes it sound like an arbitrary scale. But the values i see would all be red - when they should be more yellow, or brown.įinally, it says that Choma/Saturation can range from 0.10. So i take 7.05 to mean 70.5%.īut what is Hue measured in? i'm used to hue being measured in degrees (0.360). They say that Value(Brightness) varies from 0.10, which is fine. So my question is, can anyone convert Munsell HVC into RGB, HSB or HSL? Hue Value (Brightness) Chroma(Saturation) They quote hue, value, chroma values, and indicate they are from the 1905 Munsell description of color: I'm looking at at document that describes the standard colors used in dentistry to describe the color of a tooth.