BabelColor
®

Color Measurement
and Analysis

Use the Spectrum Generator tool to generate a spectrum which matches input tristimulus values (i.e. XYZ or L*a*b*) for a given illuminant
and Standard Observer. The conversion method used in this tool is based on Principal Component Analysis (PCA). PCA is a mathematical
process by which a few spectral components (or base vectors), typically three to six, are extracted from a large number of spectrums forming
a reference dataset. The goal of the process is that any spectrum (i.e. color) from the dataset can be obtained by adding the principal
components in various proportions, with these proportions derived using the tristimulus values for one or more illuminant. The accuracy of
the synthetized spectrum will generally increase as more components are used.
The reference dataset used for component extraction is selected to cover a large gamut and is usually representative of a given group of
pigments. The principal components of this tool were extracted from measured samples of the NCS, Munsell, and OSA-UCS color order
systems. What this means in practice is that, for the same color coordinates, a spectrum generated by this tool is likely to be more similar to a
NCS, Munsell, or OSA-UCS spectrum than to the spectrum of a Pantone chip.
- Illuminants for 3 components fit: A, C, D50, D55, D60, D65, D75, D93, E, F2, F7, F11, plus two Custom Illuminants.
- Illuminants for 6 components fit: A, C, D50, D65, E
Please consult the PatchTool Help manual for more information on the particularities of this tool.

BabelColor
®

Use the Spectrum Generator tool to generate a
spectrum which matches input tristimulus values (i.e.
XYZ or L*a*b*) for a given illuminant and Standard
Observer. The conversion method used in this tool is
based on Principal Component Analysis (PCA). PCA is a
mathematical process by which a few spectral
components (or base vectors), typically three to six, are
extracted from a large number of spectrums forming a
reference dataset. The goal of the process is that any
spectrum (i.e. color) from the dataset can be obtained
by adding the principal components in various
proportions, with these proportions derived using the
tristimulus values for one or more illuminant. The
accuracy of the synthetized spectrum will generally
increase as more components are used.
The reference dataset used for component extraction is
selected to cover a large gamut and is usually
representative of a given group of pigments. The
principal components of this tool were extracted from
measured samples of the NCS, Munsell, and OSA-UCS
color order systems. What this means in practice is that,
for the same color coordinates, a spectrum generated
by this tool is likely to be more similar to a NCS, Munsell,
or OSA-UCS spectrum than to the spectrum of a
Pantone chip.
- Illuminants for 3 components fit: A, C, D50, D55, D60,
D65, D75, D93, E, F2, F7, F11, plus two Custom
Illuminants.
- Illuminants for 6 components fit: A, C, D50, D65, E
Please consult the PatchTool Help manual for more
information on the particularities of this tool.