munsellinterpol (version 2.2-1)

RGBtoMunsell: Convert sRGB coordinates to a Munsell specification

Description

RGBtoMunsell Converts RGB coordinates to a Munsell specification, by interpolating over the extrapolated Munsell renotation data

Usage

RGBtoMunsell( RGB, space='sRGB', maxSignal=255, adapt='Bradford', ... )

Arguments

RGB

a numeric Nx3 matrix with RGB coordinates in the rows, or a vector that can be converted to such a matrix, by row. These are non-linear display values, but they are not required to be integers.

space

the name of an installed RGB space. Spaces 'sRGB' and 'AdobeRGB' are pre-installed, and others can be installed with installRGB().

maxSignal

maximum value of RGB for display. Other popular values are 1, 1023, and 65535. Even when 1, they are still taken to be non-linear display values.

adapt

method for chromatic adaptation, see CAT() for valid values. Also see Details.

...

other parameters passed to XYZtoMunsell()

Value

a numeric Nx3 matrix with HVC coordinates in the rows. The rownames are copied from input to output. In case of error, it returns NULL.

Details

The conversion is done in 3 steps.

• RGB XYZ using XYZfromRGB() with the given space and maxSignal

• XYZ is adapted from the white-point of space to Illuminant C using the given chromatic adaptation method

• XYZ HVC using XYZtoMunsell()

References

Wikipedia. sRGB. https://en.wikipedia.org/wiki/SRGB.

Paul Centore 2014 The Munsell and Kubelka-Munk Toolbox http://centore.isletech.net/~centore/MunsellAndKubelkaMunkToolbox/MunsellAndKubelkaMunkToolbox.html

See Also

XYZfromRGB(), XYZtoMunsell(), CAT()

Examples

# NOT RUN {
RGBtoMunsell( c(255,45,67) )
##                     H        V        C
##  5.4R 5.5/18 5.401135 5.477315 18.01984

RGBtoMunsell( c(255,45,67), space='Adobe' )
##                     H        V        C
##  5.9R 6.2/22 5.924749 6.214155 21.83907
# }