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I have a demo that can write "blacker than black" and "whiter than white". After multiple "full flash clear" commands, you just draw an object rapidly many times alternating black and white, ending in the final color. Black is clearly darker than a black background that was only drawn once (or even a few times). White is clearly visible on a white background. But a screen capture will show that the clearly visible "ghost text" is NOT in the framebuffer.
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