Extract

Use the Extract tool to extract a specific color channel from a color image, and view it as an 8-bit Gray Scale image.  You might do this to reduce the saturation values in a HSI image, or boost just the Blue values in an RGB image. 

Once a color channel has been extracted, it can be edited and analyzed as you'd like (treat it like any ordinary Gray Scale image).  After editing, it can be merged back into the original image or another image, using the Merge tool.

The Extract tool can only be used on True Color images.  If your image is of another class, you may convert it to True Color using the Modify tool.

To perform an extract:

1. Open the color image from which you want to extract color channel data.
2. Click on the arrow beneath the Extract tool:
   The Extract menu is displayed.
   
3. Click on the arrow to the right of the Interpretation tool.
   The Interpretation menu is displayed.
4. Select the color model that you want to use for the extraction.  For example, you can extract grayscale images representing the red, green, and blue channels of a color image if you select "RGB," or you can extract grayscale images representing the hue, saturation, and luminance channels of a color image if you select "HSL."
5. Click on the Extract tool to extract all three channels at once; click on a single channel if you want to extract only that channel.
   The extracted images will appear in the Image-Pro workspace as unsaved files.
   

Note: NOTE: If you are extracting individual color channels, one at a time, the Extract tool will continue to extract them from the original source color image, regardless of whether that image is the active image, until all channels are extracted.