I tried
$ dot -Tpng rel_graph.gv > rel_graph.png
but the resulting image has a very low quality.
I tried
$ dot -Tpng rel_graph.gv > rel_graph.png
but the resulting image has a very low quality.
I think antialiasing is driver-dependent. For example, we hardcode cairo_font_options_set_antialias(options,CAIRO_ANTIALIAS_GRAY); but I don't see anything about explicit smoothing or antialiasing in other graphics primitives or any mention of antialiasing or smoothing in any other drivers.