munsellinterpol (version 2.2-1)

sRGBtoMunsell: Convert sRGB coordinates to a Munsell specification

Description

Converts non-linear sRGB coordinates to a Munsell specification, by interpolating over the extrapolated Munsell renotation data

Usage

sRGBtoMunsell( sRGB, maxSignal=255, ... )

Arguments

sRGB

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

maxSignal

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

...

other parameters passed to XYZtoMunsell()

Value

a numeric Nx3 matrix with HVC coordinates in the rows. The rownames are copied from input to output.

Details

The conversion is done in 3 steps.

• sRGB XYZ using XYZfromRGB() with the given maxSignal

• XYZ is adapted from Illuminant D65 (from the sRGB standard) to Illuminant C using the Bradford chromatic adaptation method (CAT)

• 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(), CAT(), XYZtoMunsell(), RGBtoMunsell()

Examples

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

sRGBtoMunsell( c(1,0,1), maxSignal=1 )
##                 H        V        C
##  8P 6/26 87.98251 5.981297 25.64534
# }