How put a clear signature in a drawing

Hi we are trying to put a 'wet' signature into a drawing so when it is printed it looks like it is signed.

All going well until we tried to scan a signature, changed it to .png and inserted it into the drawing, It looks badly pixelated, and 80% of the pixels are missing!

Anyone else tried something like this and found a trick to produce a good image?

Thanks, Jim

SolidworksDrawings And Detailing