I want to remake an old game, which graphics is pretty old (1980s game), and I want to make a "HD version" of it. Of course, the game will have an "old graphics" setting, but I want to remaster the old sprites, tiles. How can I do it? Is there any program to it, or the whole graphics should be redrawn?
There do exist some pretty impressive methods for scaling up pixel art, it's not bullet proof, but some of it could at least prove to save some time in the process of a manual retouch: http://en.wikipedia.org/wiki/Image_scaling
Do remember, as long as you don't have a computer made from pure scifitanium none of them are going to add anything beyond what already was in the picture, up-scaled figures may seem oddly detail lacking.