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And how does it compare against HEIF?

by gbanfalvi 7y ago

0-_-0 7y ago
HEIF can't compress JPEG images losslessly
- rndgermandude 7y ago
  Indeed, HEIF/HEIC is basically a slightly dumbed down HEVC (h.265) i-frame (full frame) (HEIC)[1] and new container format (HEIF)[2], similar to WEBP being VP8 i-frames in a RIFF container. So they are used as full blown codecs in practice, usually not in a lossless mode, so shifting JPEG to HEIC or WEBP will lose some quality. [1] Decoding HEIC in Windows (10) requires you to have installed a compatible HEVC decoder. Which is 99 cents (and the hassle of setting up a store accounts and payment processing with MS) or an alternative free one which will use the HEVC codec that is shipped with hardware such as newer Intels (QSV) or GPUs. Thank you patent mess! [2] HEIF the container format can contain JPEG data, but in practice does not or only as a supplementary image (previews, pre-renders, thumbnails, etc)
- deleted 7y ago
  [deleted]
ksec 7y ago
Below 0.5 bpp, both HEIF or BPG [1] and AVIF performs quite a bit better than JPEG XL , XL shines in 0.8 bpp. At least in initial testing. [1] https://bellard.org/bpg/ https://bellard.org/bpg/
- ajnin 7y ago
  Do you have a link for JPEG XL comparisons ? The comparisons on that page are with JPEG XR, which is a different thing.
  - ksec 7y ago
    Unfortunately It couldn't find the exact one, it was from the author's presentation against a few other codec on common metrics such as PSNR and SSIM. There is a thread on Doom9 [1] with similar results though. [1] https://forum.doom9.org/showpost.php?p=1894341&postcount=167 https://forum.doom9.org/showpost.php?p=1894341&postcount=167
duskwuff 7y ago
Not comparable. Brunsli and Lepton are lossless compressors for JPEG files; HEIF is a completely different lossy image encoder. To compare the size of a Brunsli/Lepton encoded JPEG file with an HEIF image, you'd need to define some sort of quality equivalence between the two, which gets complicated fast.

And how does it compare against HEIF?

0-_-0 7y ago

HEIF can't compress JPEG images losslessly

rndgermandude 7y ago
Indeed, HEIF/HEIC is basically a slightly dumbed down HEVC (h.265) i-frame (full frame) (HEIC)[1] and new container format (HEIF)[2], similar to WEBP being VP8 i-frames in a RIFF container. So they are used as full blown codecs in practice, usually not in a lossless mode, so shifting JPEG to HEIC or WEBP will lose some quality. [1] Decoding HEIC in Windows (10) requires you to have installed a compatible HEVC decoder. Which is 99 cents (and the hassle of setting up a store accounts and payment processing with MS) or an alternative free one which will use the HEVC codec that is shipped with hardware such as newer Intels (QSV) or GPUs. Thank you patent mess! [2] HEIF the container format can contain JPEG data, but in practice does not or only as a supplementary image (previews, pre-renders, thumbnails, etc)
deleted 7y ago
[deleted]

ksec 7y ago

Below 0.5 bpp, both HEIF or BPG [1] and AVIF performs quite a bit better than JPEG XL , XL shines in 0.8 bpp. At least in initial testing. [1] https://bellard.org/bpg/ https://bellard.org/bpg/

ajnin 7y ago
Do you have a link for JPEG XL comparisons ? The comparisons on that page are with JPEG XR, which is a different thing.
- ksec 7y ago
  Unfortunately It couldn't find the exact one, it was from the author's presentation against a few other codec on common metrics such as PSNR and SSIM. There is a thread on Doom9 [1] with similar results though. [1] https://forum.doom9.org/showpost.php?p=1894341&postcount=167 https://forum.doom9.org/showpost.php?p=1894341&postcount=167

duskwuff 7y ago

Not comparable. Brunsli and Lepton are lossless compressors for JPEG files; HEIF is a completely different lossy image encoder. To compare the size of a Brunsli/Lepton encoded JPEG file with an HEIF image, you'd need to define some sort of quality equivalence between the two, which gets complicated fast.