J=VL_RGB2XYZ(I) converts the CIE RGB image I to the image J in CIE XYZ format. CIE RGB has a white point of R=G=B=1.0
VL_RGB2XYZ(I,WS) uses the specified RGB working space WS. The function supports the following RGB working spaces:
`CIE' E illuminant, gamma=2.2
`Adobe' D65 illuminant, gamma=2.2
The default workspace is CIE.
See also: VL_XYZ2RGB(), VL_HELP().