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Denoise before upscale: the ordering mistake, and why 2x is the ceiling

Most upscaling tutorials tell you to enlarge first. Do that and the model learns the compression blocks and enlarges them too, which is how you get a 4K file that looks worse than the 540p original.

  • Denoise before enlarging, not the other way around
  • Cap enlargement at 2x per axis to avoid invented details
  • Inspect hair edge and text at 100% resolution for quality check

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