: Chances are Delftship uses the simplest (==fastest but least effective)
: method.
: As a result, the lines get blurry when they are enlarged.

Actually I don't think Freeship scales the images at all. They are just strech to view it as correct size but the images are not scaled smaller or bigger.

If you have too low resolution image, you need to work out how you can get the image larger. It's not about Freeship/Deftship - it's about getting better original image.