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Microsoft KB Archive/101408

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Knowledge Base

Display Problems in Mouse Demo with 640x480 256-Color Drivers

Article ID: 101408

Article Last Modified on 10/3/2003


  • Microsoft Mouse Driver 9.1 Standard Edition
  • Microsoft Windows 3.1 Standard Edition

This article was previously published under Q101408


If you are using a 640 x 480 256-color video driver, horizontal zigzag patterns may appear on the screen when you run the Microsoft Mouse demonstration "Meet The Mouse," which ships with version 9.0 of the mouse driver.


This problem occurs because the source image is a 16-color bitmap and therefore often dithered. When these dithered colors appear on a relatively low-resolution display (such as 640 x 480) that supports 256 colors, horizontal zigzag patterns of alternating colors may appear. This problem is usually intensified by the graying effect, which turns every other pixel to white.


Microsoft is researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.


This problem is not normally seen in actual windows (rather than bitmaps of windows) because Microsoft Windows does not dither the colors of actual windows if the display supports them in its palette.

Additional query words: 2.00 ergo zig-zag

Keywords: KB101408