from QV internal help:
User Preferences: Printing
In the Chart Colors group, you may specify an override setting for all output from charts. You can select one of three alternative settings:
Use Chart Settings
The intrinsic chart settings regarding color or b/w will always be used.
All bitmap charts will be printed in color, irrespective of their Colors settings in the document.
Force Replace Colors with Patterns
Chart Properties: Colors
Use Patterns instead of Colors
The chart will be printed in black and white, with bar areas hatched. If unchecked, a monochrome printer will use gray scaling instead.
Displays the chart with hatched bar areas.
these are the only ways to control the printing of charts in color