Avoid jpeg compression artifacts when training Mip-NeRF360. #507
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As noted by https://nerfbaselines.github.io/, the original 3DGS work manually downscales the full-resolution images instead of using the dataset-provided downscaled images to avoid JPEG compression artifacts. This improves PSNR by ~0.3 and allows for a more fair comparison with work building on the original codebase.
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