My first two lithophanes were 8" x 10" in .25 corian done from separate photographs. They are (at least to me) fantastic. My third attempt, not so much. It was a much smaller attempt, also a different picture, of 4.5" square also in .25 corian with the same settings as in the previous successes; .04 ball nose with a set over of 8%. Cut depth of .21.
The resulting precut image was full of what looked like pock marks and pointed peaks. Nothing about it resembled the smooth even flow of my first two attempts.
I fiddled with the depth of cut and was able to smooth it out, but lost a great deal of detail and with a setting of .04 to achieve this, not much light is going to pass through.
I was also able to smooth it out by increasing the image size, but of course I don't want to end up billboard that won't fit in my house.
Any ideas would be very much appreciated, and thanks for all the great help and ideas on this forum.