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Add raster-symbolizer parameter to set premultiplied status of image #1512
Tiffs may misreport whether their pixels are stored as premultiplied (like in #1511, which breaks raster.input after 77e5858), or in the case of tiff read from gdal we have no way to know if pixels are premultiplied. For both these reasons we need a way for the user to control whether images need to be premultiplied before rendering/compositing. Will be useful for debugging future bugs too.