python 3 pyQT4 Display image with multiply blend mode or with alpha

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I'd like to set a image on top of my QT app with a multiplier blend mode (using the image as a filter), is it possible ? The other solution that could work for me is to use a separate image in grey-scale and use it as an alpha. I think this is potentially possible with QGraphicsPixmapItem but I am not sure at all how to use it.

Any help much appreciated thanks

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