My source data is the Munsell real.dat file found at:
and I need to convert this data into the sRGB color space.
I am pretty sure I know how to accomplish this, but was hoping for
some confirmation that my method is accurate.
The method I am using is based on the sample code found at:
The primary question I have is how to correctly apply a chromatic
adaptation transform to the XYZ color to convert it from its own
reference white to the reference white of the RGB system - assuming I
need to. The Munsell data was apparently calculated using illuminant
C. What is the reference white of the sRGB system? Is it D65? If so, I
believe I would want to apply the following matrix:
0.990490 -0.012269 -0.003515
-0.007115 1.015427 0.006679
-0.011434 -0.002878 0.919313
This is the Bradford matrix found at http://www.brucelindbloom.com/index.html?Eqn_ChromAdapt.html
The sample code I pointed to above does not appear to apply this
matrix and I believe that would be considered a bug which I would want
to fix in my own code.
The Munsell data also mentions that it was calculated using the ‘CIE
1931 2 degree observer’. So, my other question is how I would take
this into account in my conversion - assuming I need to…? The
general procedure for converting between XYZ to RGB found at
mention observers, but I wanted to make sure that it would not affect
the calculations and perhaps to understand what this means a little
Any thoughts would be appreciated.
p.s. The munsell data actually starts in xyY, but the conversion from
xyY to XYZ appears to be straightforward using the formula found at
Furthermore, the munsell data appears to be in the range of 0.0 -
100.0 which is why I believe the sample code above is doing the
division by 100.