Extract Single Color Plane Luminance?

[Matej Kobav]

My task is to convert an image from RBG to CIE Lab.

 

I found two ways to do it. One was discussed in http://lavag.org/topic/13885-how-to-convert-rgb-to-cie-lab/ and the other possibility is to use a function IMAQ ExtractSingleColorPlane VI. 

 

With this function is possible to directly get Luminance. What is Luminance? Is this L* in CIE Lab? And what is Intensity?

 

http://zone.ni.com/reference/en-XX/help/370281M-01/imaqvision/imaq_extractsinglecolorplane/

 

 

thanks

matej

 

[Matej Kobav]

I found out that Luminance, Value and Intensity are from HSL, HSV and HSI color space, but surely Luminance should be replaced with lightness.