Quote:
Originally Posted by madshi
But as soon as you feed those neural networks with images downscaled with a different algorithm (e.g. Lanczos instead of Catrom, or Bilinear or Box), the algos quickly fall apart. The only way to properly evaluate the quality of an upscaling algorithm is to test it with multiple different images, which were downscaled with different algorithms.
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Between the downsclaing and upscaling the image wasn't lossy compressed, this would assumingly throw it farther.