Hm... I see now when I look closely, that I unintentionally had a small transparency on a white line
Tank you!

I have traced an image from a sketch in Inkscape, so the image is in "lines/curves". When I save the image as svg I got a transparent background. However, when I save the image as an eps, I get a white background behind the image (not on the whole workspace though). Why? It feels like I'm ...