AbsorbanceToAbsorbtance

Psychtoolbox › PsychColorimetric

[absorbtanceSpectra, absorbtanceSpectraWls] =...
AbsorbanceToAbsorbtance(absorbanceSpectra, absorbanceSpectraWls, axialOpticalDensities)

Convert pigment absorbance spectra into absorbtance spectra, using the peak axial
optical density. The absorbance/absorbtance terminology is described at the
CVRL web page, http://cvrl.ucl.ac.uk. Wyszecki and Stiles refere to absorbance
the absorption coefficient (p. 588).

Both absorbtance spectra and absorbance spectra describe quantal absorption.

Absorbance spectra are normalized to a peak value of 1.
Absorbtance spectra are the proportion of quanta actually absorbed.

Equation: absorbtanceSpectra = 1 - 10.^(-OD * absorbanceSpectra)

Multiple spectra may be passed in the columns of absorbanceSpectra. If
so, then the same number of densities should be passed in the vector
axialOpticalDensities, and multiple answers are returned in the columns
of absorbtanceSpectra.

Wavelength information may be in any of the available Psychtoolbox representations,
and the returned wavelength information is in the same format as passed.

04/29/03 lyin Wrote wrote with advice from dhb
04/30/03 lyin Reorganize the variable
06/12/03 lyin Change the way variable being passed
06/23/03 dhb Check dimensions of spectra and density.
06/30/03 dhb Change to toolbox convention, put sensitivity like stuff in rows.