Is it possible to export an atlas as a PNG? I don’t want to take a screenshot of the atlas editor (even though I know you can turn off the grid). I just want the image. If not from the editor itself, maybe save it out at runtime?
There are other programs which you can be used to generate texture atlases with. What’s your use for the exported atlas png?
Yup, we’d need to know more about the use case. Parsing the generated atlas/texture is non-trivial. Are you looking to replace the generated atlas with another image?
Yh I know there are other programs, I just wanted to show the atlases that are actually in use. It’s just a documentation thing really, I’d like to write about my project and include the actual atlases the game uses
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Use the screenshot! 
If you really want something as close as possible there are a number of ways to dump textures from a running game but for your use it doesn’t sound worth the time to do it.