haven't looked because I had no reason to use it, but some graphics APIs have a ValueOfPixel() function to get the attributes of an on-screen pixel. Seems of limited use though, since it is assumed that if you put down a pixel in the first place then you should know how you rendered it. FWIW, if your QPainter is rendering to a pixmap/bitmap then you should be able to get the rendered value from that backing.
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