Quote: I tried librecad's "export as image" option and selected file type as svg. Then I opened that image in gimp. Now the ellipse looks fine but now it opened with a white background as if opening an image, not a transparent background. How can I tell if the second image opened as svg?
Import a svg, the import dialogue has a tickboxes for Import paths and Merge imported paths. Choose the Import paths option. Then you can make a new transparent layer and delete the white layer - Stroke the paths if you want, for a bitmap.
Quote:Or how can i make the ellipse look regular in the first image?
Big however for LibreCAD: This is my drawing. https://i.imgur.com/w9tBheN.jpg Two ellipse one point and drag, the smaller one 4-point. No difference in properties I can see.
In Gimp using LibreCAD export as image (svg) Does not look bad until you zoom in. Ellipse paths composed of very many small paths and not a smooth path. Looks like it has been following the rendered pixel boundaries. example: https://i.imgur.com/6vGDEyo.jpg
My advice, start looking at using Inkscape. LibreCAD default format is dxf. Inkscape will import a .dxf file but the ellipse is scaled. https://i.imgur.com/m5X5sWS.jpg Why ? I do not know.
Alternative exports from LibreCAD are that drawing (SVG) format and also PDF. Both work in Inkscape, both have annoyances. The svg drawing lines need converting from polyline objects to vector. The PDF needs ungrouping to work on individual shapes. There is still the multitude of paths making an ellipse, but these are quickly simplied, a single menu item. https://i.imgur.com/1s3rG4b.jpg There the large ellipse is simplified, small still lots of paths.
As a new svg from inkscape, into Gimp looks like this, still a bit of work to do, consolidating those polylines back into the object shapes. https://i.imgur.com/QI7Bhgp.jpg