How to draw a subpixel line

Question

In the following code, I\'m trying to draw two lines: One with a subpixel width (0.5) and the other with 1px width:

        var img = new Bitmap(256, 256);
              


        

Answer 1

The article Scaling the Pen object mentions a bug in GDI+ Pen that makes it unable to scale down properly when its width is less than 1.5.

Also, if you try to draw three lines with widths 2.0F, 2.5F and 3.0F respectively, you'll see a visual difference, so your case really looks like some issue with GDI+.