Before processing
After processing
There are three method for dither processing: Net graphic、Dot graphic、Black and white
1> Net graphic
Net graphic need adjust net size，better suited to material which is not high resolution，
or the laser is relatively slow to respond.
To get the appropriate net size, you can adjust resolution and net frequency of the
image.
The higher resolution, the more delicate.
The higher net frequency,the smaller net size.The lower net frequency, the bigger net
size.
Generally, resolution of image is 500 - 1000, and net frequency is 30-40lines.
