this post was submitted on 29 Mar 2025
260 points (99.2% liked)

Technology

68244 readers
4228 users here now

This is a most excellent place for technology news and articles.

Our Rules

  1. Follow the lemmy.world rules.
  2. Only tech related news or articles.
  3. Be excellent to each other!
  4. Mod approved content bots can post up to 10 articles per day.
  5. Threads asking for personal tech support may be deleted.
  6. Politics threads may be removed.
  7. No memes allowed as posts, OK to post as comments.
  8. Only approved bots from the list below, this includes using AI responses and summaries. To ask if your bot can be added please contact a mod.
  9. Check for duplicates before posting, duplicates may be removed
  10. Accounts 7 days and younger will have their posts automatically removed.

Approved Bots

founded 2 years ago
MODERATORS
L3s@lemmy.world
enu@lemmy.world
technopagan@lemmy.world
L4s@lemmy.world
L3s@hackingne.ws
L4s@hackingne.ws
260
Beyond RGB: A new image file format efficiently stores invisible light data (arstechnica.com)
submitted 5 days ago by cm0002@lemmy.world to c/technology@lemmy.world
23 comments fedilink hide all child comments
you are viewing a single comment's thread
view the rest of the comments
[–] AbouBenAdhem@lemmy.world 45 points 5 days ago (13 children)

Spectral JPEG XL utilizes a technique used with human-visible images, a math trick called a discrete cosine transform (DCT), to make these massive files smaller [...] it then applies a weighting step, dividing higher-frequency spectral coefficients by the overall brightness (the DC component), allowing less important data to be compressed more aggressively.

This all sounds like standard jpeg compression. Is it just jpeg with extra channels?

[–] Prok@lemmy.world 39 points 5 days ago (1 children)

Yeah, it compresses better too though, and jpeg XL can be configured to compress lossless, which I imagine would also work here

[–] dohpaz42@lemmy.world 7 points 5 days ago (3 children)

Lossless JPEG would be amazing.

[–] zerofk@lemm.ee 7 points 5 days ago

JPEG 2000 supports lossless mode.

[–] Cocodapuf@lemmy.world 2 points 5 days ago (1 children)

In my experience, as you increase the quality level of a jpeg, the compression level drops significantly, much more than with some other formats, notably PNG. I'd be curious to see comparisons with png and gif. I wouldn't be surprised if the new jpeg compresses better at some resolutions, but not all, or with only some kind of images.

[–] rice@lemmy.org 6 points 5 days ago

jpeg xl has been in development from FLIF for like 15 years there are tons of comparisons all over, even live ones on youtube

[–] uis@lemm.ee 1 points 4 days ago

There is Lossless JPEG since 1993.

load more comments (11 replies)