Psychtoolbox-3

Psychophysics Toolbox Version 3 (PTB-3) is an open-source set of Matlab and GNU Octave functions for vision and neuroscience research. It makes it easy to synthesize and show accurately controlled visual and auditory stimuli and interact with the observer. Some of its functionality is available as part of Python toolkits like PsychoPy. For licenses, commercial support and services visit psychtoolbox.net. Follow us on Mastodon, BlueSky, or Twitter @psychtoolbox

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srWlsToThetaPCone

>Psychtoolbox>PsychColorimetricData>StockmanRiderNomogram>srFunctions

thetaP = srWlsToThetaPCone(nm)(nm)

Get thetap from wavelength in nm, according to Eq 2 of the Stockman-Rider paper. This
applies to photopigment thetaPs, not to lens and macular pigment versions.

See also StockmanRiderDemo, srLconelog, srMconelog, srSconelog

Path   Retrieve current version from GitHub | View changelog
Psychtoolbox/PsychColorimetricData/StockmanRiderNomogram/srFunctions/srWlsToThetaPCone.m

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Last updated on August 13, 2026