ExtendedGetSourceRatio Last update: 09.03.2026 Description Gets the value of one of the sources of an extended or a spectral map. In case of error, returns -1 if: the map is neither an extended nor a spectral map no source in the map iSource >= number of sources in the map iSource < 0 Syntax object.ExtendedGetSourceRatio(int iSource) As Double object: Virtual Photometric Lab or Virtual Human Vision Lab object iSource: index of the source