
This Excel
spreadsheet is used to synthesize a full reflectance spectrum from an
input of only three colorimetric values, for example CIE L* a* b*, or
CIE L* C* h° or CIE X Y Z values.
It contains a macro, the macro is safe and the utility will only run
with the macro switched on. 

This Excel spreadsheet is used to
determine CIEDE2000 colour difference values from CIE L*a*b* values. It
features a method of splitting the total difference into hue, lightness
and chroma components.
Also calculated are the CIE L* a* b*, CIE L* C* H*, CMC colour
difference and CIE 94 colour difference. 
XYZtoDom 
(30Jan04) 117K 
©Colour4Free: xls 

This Excel spreadsheet is used to determine the dominant
wavelength, and excitation purity of an XYZ colour stimulus. The
complementary wavelength is also determined.
Values can be determined for the CIE 2 degree and for
the 10 degree observer functions.


Convert between: X Y Z and Y x y
L* a* b* and L* C* h°
L* u' v', L* u* v* and L* C* h°
CIE Whiteness and tint values are calculated also.

LabToRGB 
(08Feb04) 71K 
©Colour4Free: xls 

This Excel spreadsheet is used to
convert values of L* a* b* (or L* C* h) to values of RGB for a video
display screen. The conversion is based on the sRGB definitions of the
the light emitted from the display screen. 









