What monitor are you using? The AppleColor Composite Monitor (A2M6020) or the
AppleColor RGB Monitor (A2M6014)?
AppleColor Composite Monitor
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There is a switch behind the front access door that turns the Composite Monitor
to a green character on black background display. This will help the displayed
image to appear more clearly.
Additionally, the Apple IIGS Control Panel has the Monitor CDEV for selecting
color or monochrome monitor. This may help if you're using the Composite
Monitor in the single-color mode. This setting affects only the composite
output of the Apple IIGS. This is the only method we know for setting the
Apple IIGS to monochrome mode.
AppleColor RGB Monitor
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There are certain issues that affect the display on the RGB Monitor's graphics
page. If the graphic images are not placed on even nibble boundaries, there
will be color bleed that many consider unacceptable. On the RGB Monitor, the
only solution is to rewrite the programs, with the even nibble boundary issue
in mind.