"One item making the interwebs rounds this week was the scandalous revelation that Halo 3 runs at “640p” which isn’t even technically a resolution. However, the interweb detectives did notice that Halo 3’s vertical resolution, when captured from a frame buffer, is indeed 640 pixels. So what gives? Did we short change you 80 pixels? Naturally it’s more complicated than that. In fact, you could argue we gave you 1280 pixels of vertical resolution, since Halo 3 uses not one, but two frame buffers – both of which render at 1152x640 pixels. The reason we chose this slightly unorthodox resolution and this very complex use of two buffers is simple enough to see – lighting. We wanted to preserve as much dynamic range as possible – so we use one for the high dynamic range and one for the low dynamic range values. Both are combined to create the finished on screen image."
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