An article of commerce comprising an edible substrate having an image disposed thereon, and a method for making edible substrates having a variety of different images. The adhesive is selected for compatibility with a peel-and-stick installation and, thus, upon pressure activation, when the laminate with hot melt adhesive thereon is pressed against the rough surface of the masonry block, a durable bond is created. A first measurement is used to effectively measure across a full range of the sensor. Further computation savings are achievable by recognising that only light travelling in a limited range of angles need to be considered.