Here is some background that explains the nature of the
problem and provide a reasonable workaround
Background
==========
The video signal for the DOS/Windows image is actually brighter than the
Macintosh image to compensate for the dark image quality that Windows has. The poor image quality of Windows was confirmed by original beta testers for the DOS Compatibility Card. The beta users complained about Windows not being as bright and "crisp" as the Macintosh image. To compensate, the DOS video signal has actually been adjusted so it is brighter (greater signal strength) than the Macintosh video image.
In some cases though, the adjusted difference in brightness can be seen and the Windows video can slightly overdrive the display. The increased video signal strength may create streaks or ghosts of color around icons and other objects in the Windows video image.
Workaround
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In configurations where there is ghosting, color streaks or outlines in the Windows video image: switch to Windows; adjust the contrast control of the display down to minimize contrast (this should remove the ghosting or streaks); increase or adjust the brightness for an acceptable display image brightness.
This adjustment should provide an acceptable display for both Macintosh and Windows images.
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