My source data is the Munsell real.dat file found at:

http://www.cis.rit.edu/mcsl/online/munsell.php

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:

http://casoilresource.lawr.ucdavis.edu/drupal/node/201

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

http://www.brucelindbloom.com/index.html?ColorCalcHelp.html doesn’t

mention observers, but I wanted to make sure that it would not affect

the calculations and perhaps to understand what this means a little

better.

Any thoughts would be appreciated.

Thank you.

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

http://www.brucelindbloom.com/index.html?Eqn_ChromAdapt.html.

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.