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Re:10 KB Club: With links to popular HN, Reddit, Lobsters th... by lifthrasiir on Monday December 28, 2020 @02:05PM (#25562102)
I tried zopflipng [1] with the very expensive option suggested from the usage and got 2,493 bytes (original 2,740 bytes, nowhere practical as it took 3 minutes) so you don't have to sacrifice the palette, though I'm not sure if 16 or even 4 color palette will significantly alter the visual.

[1] https://github.com/google/zopfli

Re:10 KB Club: With links to popular HN, Reddit, Lobsters th... by shakna on Monday December 28, 2020 @05:41PM (#25564126)
It's already an 8bit grayscale image - significantly less than a 4 colour palette.

And whilst the server might use state of the art compression... There's still no way a much larger image is going to fit in the proposed 1-2K limit.