Canon S100SP User Manual page 158

Troubleshooting
Jagged Text or Graphics, or Banded Gradations
Ensure your application supports Quick Draw.
If you are using a PostScript-compatible application, printed text and lines may appear
jagged and gradations may appear banded. As S100SP is not a PostScript printer but a
Quick Draw printer, use an application compatible with Quick Draw for printing.
Problems Unique to the Macintosh 158