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The problem is not in the code, but on the image itself. The Geotiff has 3 bands, and the nodata value is set to 0 Band 1 Block=508x8 Type=Byte, ColorInterp=Red NoData Value=0Band 2 Block=508x8 Type=Byte, ColorInterp=Green NoData Value=0 Band 3 Block=508x8 Type=Byte, ColorInterp=Blue NoData Value=0 However inspecting the image in QGIS, it ...


You can only set the transparency if you symbolize say a point feature as a chart which in your case is pie chart. Please see the Symbology tab of your feature class. After this, you can set the transparency of your feature class from the Display tab and this will reflect on the pie charts.

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