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SkiaGeoCanvas/GeoImage generates black background

We are trying to render TIFF images using GeoTiffRasterLayer.
We are using SkiaGeoCanvas and GeoImage of ThinkGeo.Core(12.2.8) library.
The layer drawing works fine, but the background of the image, i.e. the areas that isn’t covered by layer drawing, is rendered black.
We want it to be transparent.

Please find attached the generated image for reference.

Could you send us the tiff file. We could look into more detail.