I know there is a HD version for the upload when I tested it previously, yet this doesn't guarantee quality, in fact the quality got worse. The quality you get for higher resolution turns out to be rather flat colors in the image. It is quite noticeable when you are viewing at 100% should your image is uploaded using originally jpeg format. PNG will give a better quality regardless of the size use.Originally Posted by CamInit
Hence the issue here is not the input image size at all.