glReadPixels and ATI settings

We’ve found that when the driver settings on an ATI card are set to maximum quality/minimum performance, the image returned by glReadPixels looks a little different from what we see on the monitor. It looks shifted up and left by a pixel, and a tad blurrier, as if some extra antialiasing had happened. How could glReadPixels return something different than what was just rendered to the screen?

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