[Qgis-developer] How to saveAsImage the canvas without background color ?

[Geo DrinX]

Hello,

I need to save a PNG of QGIS canvas, but I need an empty background color
(like a glass window)

If I use :

mapCanvas.saveAsImage(input_file, None, "PNG")

I obtain a white background (like a piece of paper).


What is the correct settings to have a  break through   effect  in my image
?



Thank you for any info about this


Roberto
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