Q:
Using PDFDraw the resulting image doesn't look as good as other PDF to image conversion
A:
To maximize speed of rendering, by default PDFNet uses fast re-sampling algorithms.
With PDFDraw though you can often increase image quality, without changing dpi, by enabling the
hq_image_resampling in
SetImageSmoothing.
draw.SetImageSmoothing(true, true); // second parameter is hq_image_resampling