arbitary scan
step 1: take image (here fibers of white paper, 180µm image
size, can you see where i tested the spot scan feature?)
step 2: define scan, here 512 times the "BIZ" path
step 3: run arbitray scan (see is beaching, most is done in the first
line)
step 4: take image to see photodamage (save image of step 1 and load
scan from this file)