What is an ROI?
An ROI is an Area of Interest that is isolated from the rest of the image. Certain Image-Pro commands can be constrained by an ROI. Once you have defined an ROI, the command applies to only the pixels within the ROI.
Examples of commands that are constrained by an ROI are: Save As, Cut, Copy, Duplicate, Rotate, and Resize.
For example, in Figure 7-1 below, a square-shaped ROI has been drawn around a particular object of interest in the image. When the Duplicate command is applied to the image, the ROI portion of the image is copied to a new image, as shown in Figure 7-2.