Discussion: Exporting from Open Orienteering Mapper with a transparent background

I know that I used to be able to do this awhile ago but can't seem to figure it out now.

If you export as a PNG image, you will get an image with an alpha channel. Which you can then erase desired portions to transparency in an image editing program.

Thanks. I am rusty on Photoshop so will try to look at some tutorials on Channels this weekend. In an earlier version of Photoshop, probably at least 4 years ago, when I brought a png file from O Mapper, the layer would just automatically be transparent. I didn't have to use a channel which is not my strong point.
Why do they keep changing things on me?

An easy free tool is https://onlinepngtools.com/create-transparent-png

Depending on the tools you have one other option which may produce a better quality png file would be to export from OOM to pdf and then opening your pdf with something like Adobe Illustrator and saving it as a png.