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[hansepe]

You might want to check out this thread:

How I Prepare Photos for Engraving Using Photoshop

I originally posted this over on my website at Glowforge Projects: How to Prepare a Photo Engrave Using Photoshop and Engraving on the Glowforge Laser Cutter but thought it might make an OK addition here. I think all of the photos are carrying over - fingers crossed… If you’re here, you are probably wondering how to get the best photo engrave out of your Glowforge 3D Laser Printer / Cutter. And you’re in the right place, because, besides cutting jigsaw puzzles, engraving photos keeps my machine…

You can also try the official Glowforge instructions.

Prep a Photo Engrave in Photoshop

or

Prep a Photo Engrave in Gimp