I have been testing engrave settings using a test file with increasing darkness from left to right. All of the engraves were done at 1000 speed, 450 dpi. The power was varied between 40 and 60 and the dot range was varied from 0-100 to 0-75 and then 0-50. I noticed that as the image gets darker, the engrave initially gets darker, then gets lighter again. Why is convert to dots doing this?
The photos below show this phenomenon on the following materials, from top to bottom: PG Draftboard with mask, PG Draftboard without mask, and Hardwood maple without mask (non-PG). All three materials show the same pattern.
test svg file (adapted from An engineer's perspective on photo engrave settings for wood)
engrave_test2.svg.zip (8.6 KB)