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Colour Watcher - Munsell model
Munsell was the first person to separate hue, value, and chroma into
perceptually uniform and independent dimensions back in the early 1900s. He
defined a colour model using people rather than technology and produced a
colour book of swatches which showed more colours than is possible on today's sRGB
colour space, which has a limited colour gamut designed to match that of
televisions and computer displays.
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Three-dimensional representation of original measurements |
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From the Watcher, see the Help>About display which has the opposite
diagram for an example of the Hue names surrounding a normal RGB clock
face. |
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The program will display all the Munsell colours, in various modes as these
screenshots show...
| These are all the 5PB colours that can be exactly converted to RGB.
Compare this to the previous page which shows the out-of-gamut one!
You scroll to the next hue value by using the arrow keys. |
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| As well as viewing the colours by Hue, you can scroll through them
by Chroma - this is C18 (out-of-gamut) |
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| This is the Value display, here with Value = 5 and out-of-gamut
again. There are other programs on the web which will show the Munsell
model in these three views.
If you are not sure what a colour is, then you can use the Colour
Watcher to read the values for you, in any colour space, so (for
instance) you can easily read the RGB values.
Quite neat the program reading itself for our benefit!
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| However, I have not seen this sort of display anywhere. I find it
most informative as a plot of Munsell compared to HSB - the one opposite
is perceptual Value=4.
The 45 degree straight line is where the colours should be if the two
Hue angles agreed.
What it shows is where we humans can detect hue changes in different
degrees depending on the hue. As is obvious we are not consistent
as machines are and this makes a difference when we adjust colours using
computer formula compared to our eyes. |
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| The menu behaves like the Colour Watcher and has the following
structure...
How we perceive colours and tones continues to amaze me - as these
3 snapshots hopefully demonstate.
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