Hi @jtpausti ,

>>>>Would I be able to make the polylines invisible or infinitely thin while exporting to bmp?

Yes, you can move these polylines to another Layer and turn it off before exporting to BMP or other raster format - JPG, PNG.

>>>>It's the only format this application accepts, and I'm concerned about intermediate exports disrupting the scale of the drawing.

You can also use JPGOUT and PNGOUT commands.

If you are worried about drawing scale, you can use the trick with creating PDF at first (as I wrote before, and >>>>here<<<<) and then exporting PDF to raster format in Preview.app