Chapter 3
Grayscale and Color Measurements
IMAQ Vision for LabWindows/CVI User Manual
3-8
ni.com
image. Using
imaqReplaceColorPlanes()
, you can reassemble a color
image from a set of three 8-bit images, where each image becomes one of
the three primary components. Figure 3-4 illustrates how a color image
breaks down into its three components.
Figure 3-4.
Primary Components of a Color Image
Use
imaqExtractColorPlanes()
to extract the red, green, blue, hue
saturation, intensity, luminance, or value plane of a color image into an
8-bit image.
Comparing Colors
You can use the color matching capability of IMAQ Vision to compare or
evaluate the color content of an image or regions in an image.
Follow these steps to compare colors using color matching:
1.
Select an image containing the color information that you want to use
as a reference. The color information can consist of a single color or
multiple dissimilar colors, such as red and blue.
32
Color
Image
8-bit Image Processing
Saturation
Value
Hue
Green
Blue
Red
Saturation
Intensity
Hue
Saturation
Luminance
Hue
32
Color
Image
Saturation
Value
Hue
Green
Blue
Red
Saturation
Intensity
Hue
Saturation
Luminance
Hue
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
or
or
or
or
or
or
