evazion 2ffe973275 MediaFile: add support for creating .webp and .avif thumbnails. ...

These other formats aren't actually generated during upload, but support
for creating them is there.

Also tune the parameters for generating JPEGs:

* Use Q=85 instead of Q=90 because Q=85 enables 4:2:0 chroma
  subsampling, while Q=90 doesn't use subsampling. Subsampling reduces
  filesize by ~30% in most cases. It does reduce quality for certain
  images, particularly for images with lots of bright red, but in most
  cases the quality difference isn't noticeable.

* Enable several MozJPEG-specific options, including trellis
  quantization and scan optimization. These reduce filesize without
  reducing quality, at the cost of slower encoding times.

2021-12-01 04:45:26 -06:00

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