Adding noise is definitely helps, but removing noise is more or less the main feature of supersampling. If you didn't have any noise you could just simply inve

Adding noise is definitely helps, but removing noise is more or less the main feature of supersampling. If you didn't have any noise you could just simply invert the Gaussian blur, as blurring is a reversible operation (in theory, in practice you have noise, hence the need for supersampling). Annoyingly it's hard to come up with a method that doesn't leak any information, although heavily pixelating the image (and optionally blurring the few leftover pixels) would probably make it infeasible to recover the original (except maybe with a truly stupendous amount of footage).