Comment by JyrkiAlakuijala

3 months ago

Would PDF 2.0 (which also depends JPEG XL and Brotli) put pressure on Firefox and Windows to add more easy to use support?

13 comments

JyrkiAlakuijala

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GuB-42  3 months ago

Brotli? Is it still relevant now that we have Zstandard?

Zstandard is much faster in just about every benchmark, sometimes Brotli has a small edge when it comes to compression ratio, but if you go for compression ratio over speed, LZMA2 beats them both.

Both Zstandard (zstd) and LZMA2 (xz) are widely supported, I think better supported than Brotli outside of HTTP.

  • JyrkiAlakuijala  3 months ago

    Brotli decompresses 3-5x faster than LZMA2 and is within 0.6 % of the compression density, and much better for short documents.

    ZStandard decompresses ~2x faster than Brotli but is 5 % less dense in compression density, and even less dense for short documents or documents where the static dictionary can be used.

    Brotli is not slow to decompress -- generally a little faster then deflate through zlib.

    Last time I measured, Brotli had ~2x smaller binary size than zstd (dec+enc).

    • GuB-42  3 months ago

      Straight from the horse's mouth!

      The thing is that Brotli is clearly optimized for the web (it even has a built-in dictionary), and ZStandard is more generic, being used for tar archives and the likes, I wonder how PDF would fit in here.

jchw  3 months ago

I don't think so: JPEG 2000, as far as I know, isn't generally supported for web use in web browsers, but it is supported in PDF.