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JPEG is not a good choice for UI/typography screenshots. There are ~1MB of JPEGs at quality 50 on the page. By using PNG8 not only you can halve that size but also preserve original quality. Example:

  [1] PNG24 199 144 bytes
  [2] JPEG 94 699 bytes
  [3] PNG8 47 155 bytes
[1] https://user-images.githubusercontent.com/3129436/47068394-d...

[2] https://user-images.githubusercontent.com/3129436/47068393-d...

[3] https://user-images.githubusercontent.com/3129436/47068392-d...

Thanks for sharing this, will make sure to use PNG8 in the future!

That annoyed me as well, seems like the worst possible choice of format and quality for the given images.

Not to mention [1] could be almost halved size if run through the default (fast) options of optipng (or just compressed properly by whatever generated it).

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