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JPEG quality 75 at 4:4:4 beat 0.99 at 4:2:0 on red text

I look after the client-side encoding path at ImgIng, and a few days ago I spent an afternoon on a sale poster with saturated red text.

  • JPEG quality 75 with 4:4:4 chroma subsampling outperformed 4:2:0 at 0.99
  • 4:4:4 maintained cleaner appearance for red text while saving space
  • Higher quality did not significantly improve results, making 4:4:4 cost-effective

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