Edge and Profile thickness

Something annoys me when I try to have control on thickess of edges and profiles.
For quality reasons, I have to export (.png) view of my model in high resolution (for example : 5000 x 4000 px). But at this size, edges and profiles appears too thin for me.

I use the “scale factor” when exporting to increase thickness, but the problem is : the scale factor is not applied in the same way for edges and profiles.

Is there a way to have the same thickness for edges and profiles (with higher scale than 1)

(Sorry, screenshots are in french)

Code I use for exporting :
Sketchup.active_model.active_view.write_image( { :filename=>'C:\Render.png', :width=>5000, :height=>4000, :antialias=>true, :scale_factor => 5, :transparent=>false } )