Ezcad2 tutorials: How to mark bitmap with Fiber laser ?

This video shows you how to mark bitmap with Fiber laser machine.
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[@SVTBansheeman]

I don't use ezcad so I have to figure out why you do certain things. What's the reason for 300 m/s speed? Why 25 khz frequency? What does scan line in recent and disable mark low gray point do? If you don't check select them? How do we know how much gamma correction?