Converting 32-bit Color Images to 8-bit Images in Vision Assistant

To extract a color plane from an image in Vision Assistant, follow these steps:

1. Open Vision Assistant application. You can open Vision Assistant from Windows start menu or LabVIEW's Vision Assistant palette.
2. In Vision Assistant dialog, select File >> Open Image to open the image you want to extract the color plane.
3. Select Processing Functions: Color at the left menu.
   
    
4. Add the Color Plane Extraction step from the list of Color Processing Functions.
   
    
5. In the Setup window, choose the desired color plane.  The Processing Window will display a preview of the resulting grayscale image.
   
    
6. Click OK to complete the setting.

Additional Information

A 32-bit color image is encoded in memory as either an RGB (Red, Green, Blue) or an HSL (Hue, Saturation, Luminance) image.  RGB images store color information using 8 bits each for the red, green, and blue planes. HSL images store color information using 8 bits each for hue, saturation, and luminance.  In both cases, the alpha plane is not used.

Figure 1. RGB Format


Figure 2. HSL Format
To convert the color image to an 8-bit grayscale image, you can simply extract the desired 8-bit plane from the color image.