I have the following lines of code:

        big = QImage(size, images[0].height(), QImage.Format_ARGB32)
        big.save("test.png")

The resulting test.png file contains random garbage, so I need to clean that out. I've tried to use a QPainter calling eraseRect(), but that removes the transparency by drawing a color. If I try setting the brush transparent, nothing is drawn, and nothing is cleared.

How can I clean the image leaving the image transparent?
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