Laser engraving or engraved preview

I'm working with a client who, among other things, offers products that can be customized via laser engraving. 

Is there a way to show a preview—even rough—of what this would look like to the customer?

I envision as they add logos/designs/images to the canvas, all color is removed and/or possibly made line art where the customer might have some kind of threshold slider or something like that.

The goal here is: if a color image/file is uploaded, to not have a color image/file shown on the canvas as to not confuse the customer of the final outcome of the product.