National Instruments Printer PCI-1405 User Manual download pdf (Page 20)

Appendix A Introduction to Color

Hue, Saturation, Luminance, and Intensity Planes

The NI 1405 can return an 8-bit Luminance (L) plane, but not Hue (H) or

Saturation (S) planes. You can use the NI Vision Development Module or

Vision Builder AI to convert the RGB data from the NI 1405 to HSL or

Hue, Saturation, and Intensity (HSI) planes.

Luminance, intensity, hue, and saturation are defined using the red, green,

and blue values in the following formulas:

Luminance = 0.299 × Red + 0.587 × Green + 0.114 × Blue

Intensity = (Red + Green + Blue) / 3

Hue = ATN2 (Y, X)

where

Y = (Green – Blue) / and

X = (2 × Red – Green – Blue) /

Saturation =

32-Bit HSL and HSI

You can also pack the three 8-bit HSL planes or the three HSI planes

in one array of 32-bit integers, which is equivalent to the 32-bit RGB

representation.

255 1

3 Min R G B,,()×

RGB++

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National Instruments Printer PCI-1405 User Manual Page 20