What's the difference between HSL and HSI in assistant7.1?

[interisting]

Maybe, it's a simple question but I really want to know it.And in color space of image, how can I obtain the value of 'L' from the values of RGB? Who can tell me???
Thanks!!!

[liaw82]

Hi..

You can extract a single plane of 8-bit Luminance from an input of RGB color image. There is a vi used to extract any single color plane you want..Did I solve your problem?

Message Edited by liaw82 on 04-09-2005 08:06 AM

[nickbike]

Hello interisting,
Here is some more information:
HSL = Hue Saturation and Luminance
HSI = Hue Saturation and Intensity

Luminance: A measure of the amount of light reflected from a hue. Those hues with a high content of white have a higher luminance or value.

Intensity: Is how light or dark a color is.

liaw82 was correct in saying there is a function to extract the luminance plane from a RGB image. If you look under the "Processing Functions: Color" of Vision Assistant, you will find an extract color plane section. In there you will find "HSL-Luminance Plane"

Nicholas C
National Instruments
Applications Engineering

[interisting]

thanks!
that's what i want!