This test shows how the laser cutter handles raster engraving of different font sizes and how you can improve the quality of your engraving. Our current set up uses 3 colors for 3 different intensities of raster engraving: – light gray for light raster engraving – medium gray for medium raster engraving – black for heavy raster engraving The way the laser cutter works is like an old dot matrix printer except instead of dots of ink it uses pulses of the laser beam.