this post was submitted on 27 Nov 2023
41 points (97.7% liked)

Linux

48212 readers
695 users here now

From Wikipedia, the free encyclopedia

Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

Rules

Related Communities

Community icon by Alpár-Etele Méder, licensed under CC BY 3.0

founded 5 years ago
MODERATORS
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
41
your stance on image compression and/ or avif/jxl? (lemmy.ml)
submitted 11 months ago by [email protected] to c/[email protected]
12 comments fedilink hide all child comments
 

Do you have a general stance about it?

Once every couple of months I look into the state of both projects and it's slow but steadily progressing.

I am mainly looking into it because of the file compression. My tests showed that I can save up to 70% in disk space for a jpg image without losing too much information for both formats, avif and jxl. It depends on the images but in general it's astonishing and I wonder why I still save jpgs in 100% quality.

But, I could also just save or convert my whole library to 70% jpg compression. Any advice?

top 12 comments
sorted by: hot top controversial new old
[–] [email protected] 42 points 11 months ago

JXL is the best image codec we have so far and it's not even close. I did a breakdown on some of its benefits here. JXL can losslessly convert PNG, JPG, and GIF into itself, and can losslessly send them back the other way too. The main downside is that Google has been blocking its adoption by keeping support out of Chromium in favor of pushing AVIF, which started a chicken and egg problem of no one wanting to use it until everyone else started using it too. If you want to be an early adopter you can feel free to use JXL, but just know that 3rd party software support is still maturing.

Something you might find interesting is that the original JPEG is such a badass format that they've taken a lot of their findings from JXL and made a badass JPEG encoder with it named jpegli. Oddly, jpegli-based JPEGs are not yet able to be losslessly-compressed into JXL files, per this issue - hopefully that will be fixed at some point.

[–] [email protected] 22 points 11 months ago (1 children)

jxl is love. jxl is life (also afaik re-encoding jpeg to jxl is lossless)

[–] [email protected] 12 points 11 months ago

Yes it's lossless. JPG->JXL lossless compression is generally 20% savings for free.

[–] [email protected] 10 points 11 months ago (2 children)

Don't compress your images to 70% jpg!!!
HDD space is essentially free, just get more. With a 70% quality jpg, you lose the ability to crop, edit or blow up your images. It basically limits you to looking at them on a screen. And even there, you'll get jarring artifacts in dark areas.

[–] [email protected] 8 points 11 months ago* (last edited 11 months ago)

I think they were saying that they could save space by converting their existing jpg files to avif or jpgXL, ~~not converting to a 70% quality jpg~~. JpgXL can do this losslessly so there's no drawback there, but converting to avif would be a lossy to lossy transcode.

EDIT: I completely missed OP's last paragraph, which does say they are considering converting their existing jpg files into 70% jpgs.

[–] [email protected] 1 points 11 months ago (1 children)

With a 70% quality jpg, you lose the ability to crop, edit or blow up your images. It basically limits you to looking at them on a screen.

I don't understand what you mean! 🧐

If I have a 70% quality jpeg, I can open it in Gimp and crop, edit or blow up (a bit) the image.

[–] [email protected] 3 points 11 months ago (1 children)

You can, but 70% quality has visible jpeg artifacts and any editing makes them worse.

[–] [email protected] 2 points 11 months ago

Oh. I see!

Thank you 😊

[–] [email protected] 2 points 11 months ago

I would really like an android gallery allowing for "full size" favourites with one click. All others get compressed.

I some time had 10GB images in total. Jpeg is already awesome.

No idea why the browsers just dont support it

[–] [email protected] 1 points 11 months ago* (last edited 11 months ago) (1 children)

Jpg at 70% will lose a significant amount of detail. It is a "lossy" format, you cant judt compress data for nothing.

AVIF is significantly more efficient than jpeg, so it loses less image data for higher compression (smaller file sizes).

JXL supports both lossy and lossless compression, and is supposed to be more efficient yet over AVIF. However it's got proprietary all over it because Google et al. For thst alone I would shy away from JXL and go AVIF.

[–] [email protected] 3 points 11 months ago

JXL is not proprietary. It's an open, royalty-free format whose reference implementation is BSD-licensed.

[–] [email protected] 0 points 11 months ago

I always shoot in raw+jpeg with the jpeg quality set to 100%. The raw files have a higher dynamic range and there is little or no processing done to them. The files are large, but storage space is cheap these days. The jpeg files are for convenience and if I don't like the way they come out, I can process the raw file however I want and export it to whatever format is most suitable for what I'm using it for.