I finally managed to reproduce the issue with the watermark image that Alex provided. I tested it on Win7 with the exact same results. I converted the image to jpg (flattened alpha) and that worked as expected.
I suppose it fails somewhere around imtools.reduce_opacity . There's some special case it's missing.
I finally managed to reproduce the issue with the watermark image that Alex provided. I tested it on Win7 with the exact same results. I converted the image to jpg (flattened alpha) and that worked as expected.
I suppose it fails somewhere around imtools. reduce_ opacity . There's some special case it's missing.