颜色理论：如何将Munsell HVC转换为RGB / HSB / HSL [英] Color Theory: How to convert Munsell HVC to RGB/HSB/HSL
问题描述
我在看看描述牙科中用于描述牙齿颜色的标准颜色的文档。他们引用 hue ，值， chroma 值，并指出它们来自1905年Munsell描述的颜色：
由AH Munsell在1905年开发的颜色符号系统
根据三个标识颜色
属性：HUE，VALUE ）
和CHROMA（饱和度）[）
$
b
$ b
色调值（亮度）色度（饱和度）
=== =============== === ==================
4.5 7.80 1.7
2.4 7.45 2.6
1.3 7.40 2.9
1.6 7.05 3.2
1.6 6.70 3.1
5.1 7.75 1.6
4.3 7.50 2.2
2.3 7.25 3.2
2.4 7.00 3.2
4.3 7.30 1.6
2.8 6.90 2.3
2.6 6.70 2.3
1.6 6.30 2.9
3.0 7.35 1.8
1.8 7.10 2.3
3.7 7.05 2.4
他们说Value（Brightness）从 0..10 变化，这很好。所以我取7.05意味着70.5％。
但是 Hue 是什么？我习惯于 degrees （0..360）测量色调。
最后，它说Choma /饱和度可以从 0..10 ...或更高 - 这听起来像一个任意的刻度。
因此，任何人都可以将Munsell HVC转换为HSB或HSL，或者更好的是RGB？
这里是不完整的（4.5应 4.5Y 等）。因为链接是死的，如果有人感兴趣，规范仍然活着在这里：
http://web.archive.org/web/20071103065312/http://lib.umich.edu/dentlib/Dental_tables/Colorshadguid.html
我可以找到的唯一免费的Munsell转换工具是：
http://web.archive.org/web/20020809130910/standards.gretagmacbeth.com/cmc/munsell.exe
很老，你可以看到，但似乎工作得很好。目前可以执行此操作的程序不是免费的：
- http://livingstonmanor.net/Munsell2/index.htm
- http://www.babelcolor.com/main_level/download.htm （此产品已免费试用14天）
当前的Munsell产品持有者是 X-Rite ，他们可能还有一些转换解决方案。
此外，请注意，您提供的链接包括其他颜色坐标中相同颜色的定义，即Yxy和CIE l * a * b *。两者都可以在 http://www.colorpro.com/info/tools/convert.htm或离线使用此自由颜色转换器
I'm looking at at document that describes the standard colors used in dentistry to describe the color of a tooth. They quote hue, value, chroma values, and indicate they are from the 1905 Munsell description of color:
The system of colour notation developed by A. H. Munsell in 1905 identifies colour in terms of three attributes: HUE, VALUE (Brightness) and CHROMA (saturation) [15]
HUE (H): Munsell defined hue as the quality by which we distinguish one colour from another. He selected five principle colours: red, yellow, green, blue, and purple; and five intermediate colours: yellow-red, green-yellow, blue-green, purple-blue, and red-purple. These were placed around a colour circle at equal points and the colours in between these points are a mixture of the two, in favour of the nearer point/colour (see Fig 1.).
VALUE (V): This notation indicates the lightness or darkness of a colour in relation to a neutral grey scale, which extends from absolute black (value symbol 0) to absolute white (value symbol 10). This is essentially how ‘bright’ the colour is.
CHROMA (C): This indicates the degree of divergence of a given hue from a neutral grey of the same value. The scale of chroma extends from 0 for a neutral grey to 10, 12, 14 or farther, depending upon the strength (saturation) of the sample to be evaluated.
There are various systems for categorising colour, the Vita system is most commonly used in Dentistry. This uses the letters A, B, C and D to notate the hue (colour) of the tooth. The chroma and value are both indicated by a value from 1 to 4. A1 being lighter than A4, but A4 being more saturated than A1. If placed in order of value, i.e. brightness, the order from brightest to darkest would be:
A1, B1, B2, A2, A3, D2, C1, B3, D3, D4, A3.5, B4, C2, A4, C3, C4
The exact values of Hue, Value and Chroma for each of the shades is shown below (16)
So my question is, can anyone convert Munsell HVC into RGB, HSB or HSL?
Hue Value (Brightness) Chroma(Saturation)
=== ================== ==================
4.5 7.80 1.7
2.4 7.45 2.6
1.3 7.40 2.9
1.6 7.05 3.2
1.6 6.70 3.1
5.1 7.75 1.6
4.3 7.50 2.2
2.3 7.25 3.2
2.4 7.00 3.2
4.3 7.30 1.6
2.8 6.90 2.3
2.6 6.70 2.3
1.6 6.30 2.9
3.0 7.35 1.8
1.8 7.10 2.3
3.7 7.05 2.4
They say that Value(Brightness) varies from 0..10, which is fine. So i take 7.05 to mean 70.5%.
But what is Hue measured in? i'm used to hue being measured in degrees (0..360). But the values i see would all be red - when they should be more yellow, or brown.
Finally, it says that Choma/Saturation can range from 0..10 ...or even higher - which makes it sound like an arbitrary scale.
So can anyone convert Munsell HVC to HSB or HSL, or better yet, RGB?
The hue specification you've given here is incomplete (4.5 should be 4.5Y etc). Since the link is dead, if anyone is interested, the specs are still alive here: http://web.archive.org/web/20071103065312/http://lib.umich.edu/dentlib/Dental_tables/Colorshadguid.html
The only free utility for Munsell conversion I could find was this:
http://web.archive.org/web/20020809130910/standards.gretagmacbeth.com/cmc/munsell.exe
Very old as you can see, but seems to work well. Current programs that can do this are not free:
- http://livingstonmanor.net/Munsell2/index.htm
- http://www.babelcolor.com/main_level/download.htm (this one has a free 14 day trial)
The current holders of the Munsell products are X-Rite, they probably have some conversion solutions as well.
Further, note that the link you supplied includes definitions for the same colors in other color coordinates - namely Yxy and CIE l*a*b*. Both can be freely converted online at http://www.colorpro.com/info/tools/convert.htm or offline with this free color converter
这篇关于颜色理论：如何将Munsell HVC转换为RGB / HSB / HSL的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
