Convert sRGB coordinates to a Munsell specification
Converts non-linear sRGB coordinates to a Munsell specification, by interpolating over the extrapolated Munsell renotation data
sRGBtoMunsell( sRGB, maxSignal=255, ... )
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 |
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()
a numeric Nx3 matrix with HVC coordinates in the rows. The rownames are copied from input to output.
The function RGBtoMunsell() also performs this conversion.
The only reason to use this one is that it takes a little less time,
since the CAT (using the Bradford method) is precomputed.
Jose Gama and Glenn Davis
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
XYZfromRGB(),
CAT(),
XYZtoMunsell(),
RGBtoMunsell()
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
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