Snap to Black

so the idea is to have the view port cursor snap to the colour value of 0,0,0, allowing the tracing of blueprints to be both faster and more accurate, along with that , the ability to have the computer calculate the points needed to produce a trace along a given area from a start click and an end click, with a numerical field to allow a user defined amount of points to be added, I'm sure other people would have ideas as to what other features could be added to this, i haven't seen a feature like this in any of the software I've used, so maybe this could be an exclusive feature that only blender has.