In the first place I recognize most of you are either wood, or vinyl experts. SO, does anyone engrave wine bottles? I want to do this as a fun hobby. I see youtube videos, most do not go into the process deeply enough.

I have a rotary with my laser engraver. I need to know what format to use, positive or negative. Then dimension settings. When I use the positive the graphic is huge, even when I set the screen picture down to 3 mm. And it the curvature of the bottle makes the photo look goofy.

So based on the above, any ideas what I am doing incorrectly?

Thank you

Roy