HOW to calculate the Color Rendering Capacity ?

* Using spectral reflectance curves of the type that is a single reflecting band or a single
   absorbing band and has the spectral reflectance of either 0.0 or 1.0, in conjunction  
   with the light source of given spectral power distribution, calculate the chromaticities for
   which the luminance factor Y has a specified value between 0.0 and 1.0 .
* All of these calculated chromaticity points define a polygon holding a plane area in the L*u*v*
   coordinate system. This plane area is the maximum range occupied by the chromaticities
   that can be produced with the specified value of luminance factor Y (a specified value of
   L* between 0 and 100) under the given light source. 
* Calculate every area of this kind, each being associated with one specified value of L*
   between 0 and 100. All these areas can be piled up to form a solid in the L*u*v* color space.
* The sum of all these areas gives, approximately, the volume of the color solid. This volume
   corresponds to the total number of the colors that can be rendered by the given light source
   with one unit luminous flux . 
* A figure proportional to the volume of the color solid is the Color Rendering Capacity for
   the light source of given spectral power distribution. For reference, the volume of the color
   solid for an equal-energy spectrum is defined as having a color rendering capacity of 1.00 .
* A software CRC99 has been available for calculating the Color Rendering Capacity of any
   sort of light source.

Download a simplified version of CRC99 to calculate the
color rendering capacity of any light source: CLICK HERE
(To run this version of CRC99, Visual Basic 6.0 is needed in your computer!!!)
1 Download file Crc99.zip to drive C:
2 Extract the file to folder C:\Crc99\
3 Run C:\Crc99\Crc99.exe, that is all.

A printout of CRC99 calculation results:

To download a standard version of CRC99 with all the necessary components
included, please visit the following web address:

CONTACT: [email protected]

TRY CRC99 online now
(All needed is to enter your light's Spectral Power Data at 380nm, 390nm, ..., and 760nm,
39 entries in all, ENTER THEM ONE BY ONE, please be patient ! -)

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