@wiredfool you are talking about https://github.com/d-schmidt/Pillow/blob/09315f263bc69ae76340679c1f34e83591ab28c8/PIL/PngImagePlugin.py#L251 following? I got suspicious too while trying to fix the save. If you don't fix till tomorrow, I will take a look at the load too. I'm going home now, it is late here.