GCC Technologies LaserPro Spirit Series User Manual page 139

Each diffusion type presents the shade of image as different spread halftones instead
of dots to compose a raster image.
The following diagram is an example of the raster effects when using the different
diffusion types.
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There is no "correct" or "best" setting when using the Raster options. The most
appropriate settings will be based on a variety of factors: your design, the
material you are engraving on, and the results you wish to achieve, etc. Please
take some time to experiment with the multitude of raster options to get the one
you feel is the best for your piece. This is where much of the fun in engraving
is....experimentation!
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