Transparant PNG creates strange artifacts Answered
If a transparant PNG image is uploaded, it creates strange artifacts after the instructable website changes it's size.
A nice platter of weird colors in the Transparent areas.
Strangely enough if a ridiculous high resolution is chosen while uploading, 1024px wide or more it creates a correct image.
(my best guest is that the image converter crokes on the image size, and does the conversion in the background later on).