With the Hewlett-Packard PaintJet driver version 1.0, the "50% reduction" and "Precision bitmapping" options are only available with the following versions: (ones with "yes")
Claris CAD 1.0v1 ............... yes
Claris CAD 1.0v3 ............... no
Claris CAD 1.0v3 (Customized High Resolution version) ............... no
With the HP PaintJet driver 3.07 and Claris CAD 2.0v3, the "Precision Bitmap" option is always grayed out (ie, is not available). This is true even if the "more options, less resolution" option is checked in Preferences.