This software has a tools to analyzing color of images. This item work as a laboratory for study about color in image and its changings. For using this ability you should use "Analysis->Color Lab" menu. As you can see in Fig 8-1, a window will be appeared.
Figure 8‑1. Color Lab window
In this window you can select two point to visit how color is changed in this line. You can select these points witch clicking on image. If you want to keep both point in a horizontal line you should press and keep middle button of mouse.
In the bottom of the window you can see a chart that shows color changes.