Support exclusion zones #163
Description
This is a really great tool for checking images.
However, sometimes there are dynamic areas in the actual image which is subject to verification.
So a static expected image fixture won't do the job.
A simple solution would be : before comparing the images draw a black rectangle on specified position on both expected and actual images so any difference would be eliminated.
Another more elegant solution might be : mark the exclusion zones in the expected image in a certain way and the tool would simply ignore them . They can be marked with either maximum opacity alpha:255 or specific color which can serve as ignore color.
Does this sound like a useful feature and what option seems better?
Regards