Hey, so I discovered this cool japanese site, Waifu2X which is intended to upscale anime images
but it works great on anything else. It uses a neural network and the technology is really promising
Im working on some showcase stuff but all my weapon sprites are only 425x115 and re-rendering them all would be a huge effort, but with the website I just scale them up and surprisingly it looks pretty decent, saves me so much time.
you can use it here for free in the browserhttp://waifu2x.udp.jp/index.de.html
Really cool stuff, give it a try