How do I get the CO2 laser to not engrave specific colors

I have a CO2 80W laser. I have several images that are black and white. I want to engrave the white and not the black or I want to engrave the black and not the white, when inverting. Everytime I do this on the laser it fills in the background. I also have a fiber laser and it just cuts the image not the background. I assume it is a setting or something I am missing… any help would be appreciated.

Thank you

Share some images of what you want to engrave, along with the results you are currently getting. Would be helpful to “see” what you are after. :slight_smile:

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