We introduce a new technique for subpixel reconstruction antialiasing (SRAA). The core idea is to extend the success of MLAA-style postprocessing with enough input to accurately reconstruct subpixel geometric edges. SRAA operates as a postprocess that combines a G-buffer sampling strategy with an image reconstruction strategy. The key part is to sample the shading at close to screen resolution while sampling geometry at subpixel precision, and then estimate a superresolution image using a reconstruction filter. That superresolution image is then filtered into an antialiased screen-resolution image. In practice, the reconstruction and downsampling occur simultaneously in a single reconstruction pass. Our results demonstrate that SRAA can approximate the quality of supersampling using man using many fewer shading operations, yielding a net 4-16_ speedup at minor quality degradation compared to shading at each subpixel sample.