From Epilog site nice tutorial for have nice 1bit photos ready for engraving think nice for we laser too need to try.
http://support.epiloglaser.com/article/8205/50104/photo-processing-for-engraving-on-wood-coreldraw-x7
Thanks for that Mauro. I did one of these just last night, having seen a video on YouTube https://www.youtube.com/watch?v=yllZTBA0HO0
It took me about 40 minutes from deciding to do it to the finished item, probably 10 minutes of that was finding a suitable photo 