this post was submitted on 21 May 2025
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I'm working on a project which generates images in multiples sizes, and also converts to WEBP and AVIF.
The difference in file size is significant. It might not matter to you, but it matters to a lot of people.
Here's an example (the filename is the width):
Also, using the
<picture></picture>element, if the users' browsers don't support (or block) AVIF/WEBP, the original format is used. No harm in using them.(I know this is a meme post, but some people are taking it seriously)
Literally just today solved a problem of delivering analytics plots over our internal chat system. The file size limit is 28Kb and I was just getting ready to say screw it, can't be done.
Lo and behold our chat system that doesn't support svg does support webp. Even visually complicated charts come in just below the size limit with webp.
Why 28Kb though?
Honestly no idea. It's funny though. The API allows us to either read it directly from our lakehouse with the 28Kb limit, or allows us to encode it in a json object. It actually recommends using the json method if we want to send larger files... but then complains it's too large if it's over 28Kb 🤷♂️
I think it was probably originally only intended to allow attaching icons.
Feels like a bug where someone forgot the 1 in 128kb. What chat app is this?? In Slack, custom emojis can be up to 128kb in filesize
It's apparently PowerAutomate Adaptive cards.
It's MS Teams with their PowerAutomate flows from Fabric. The limitation might not exist in the direct rest API, which I could have used through Python; but it's a hackathon, and my other team mates know PowerAutomate. Faster if we each coordinate using what we're good with.
I've mentioned this topic in regards to animated images, but don't see as big a reason to push for static formats due to the overall relatively limited benefits other than wider gamut and marginally smaller file size (percentage wise they are significant, but 2KB vs 200KB is paltry on even a terrible connection in the 2000s).
What I really wish is that we could get more browsers, sites, and apps to universally support more modern formats to replace the overly bloated terribly performing and never correctly pronounced animated formats like GIF with something else like AVIF, webm, webp (this was a roughly ~60MB GIF, and becomes a 1MB WEBP with better performance), or even something like APNG...
Besides wider gamut, and better performance, the sizes are actually significant on all but the fastest connections and save sites on both storage and bandwidth at significant scale compared to the mere KB of change that a static modern asset has.
This WEBP is only 800KB but only shows up on some server instances since not every Lemmy host supports embedding them :
Is that last webp animated? Asking because I know jerboa (Lemmy client) doesn't play animated images
It's pronounced GIF
You still need to resize the images and choose the right ones (even if only for the device's performance).
So we might as well do that small extra step and add conversion to the process.
Isn't that the users' fault? And of the websites for allowing those huge GIFs.
Apparently browsers have supported MP4 for a long time.
https://caniuse.com/mpeg4
But why webp over jxl
We already have the solution
https://caniuse.com/jpegxl
Webp is supported in browsers. Jxl is not, unfortunately.
(Well, I have the Firefox extension for it, but most people can't see them...)
People should still use it tho, with the fallback of webp or avif
Firefox just hasn’t enabled the setting (well they haven’t made the setting enable jxl support yet even though the setting and support has been there for years). This means their forks support it, that’s why I switched to Waterfox
Safari supports it
Chromium removed support for it 2 years ago to push webp but it’s just a reminder to not use Chromium browsers
I'm mad tho! I have technical issues with a format that works for hundreds of millions of users daily with the only impact being their website loads faster! RAGE!
Just use jxl; it is better and not created by shitty googol.
How is the size difference after gzip compression? Probably pretty much the same, but I wonder how large the difference is then. Since a lot of folk make sure the contents is gzipped when served to the user.
Even using the highest compression levels, barely any difference. Not worth it
If I understand correctly gzip, brotli and similar are best used to compress text.
Font files also shouldn't be compressed. A TTF file compresses a bit, but a WOFF2 file will be even smaller than that (and WOFF2 also doesn't compress well). So might as well use WOFF/WOFF2
Compression algos should be used on uncompressed data. Using them on already compressed data (most video, images, music formats) is generally useless.
Thanks, very interesting results
https://xkcd.com/927/
Is the quality the same? If so how do you know? I mean it's better, I'm just curious.
Tldr: as we deal with a problem long enough we find more effective ways of dealing with it
https://jpegxl.info/
Has some info on what it does
https://en.m.wikipedia.org/wiki/JPEG_XL
Technically details might be more what you are looking for
https://jpegxl.info/resources/jpeg-xl-test-page
And a test page, if you don’t see jxl images then you should look at updating your browser
So you have no hard proof (no critic here, I'm just curious)? Not that it's better but that your test images has the same quality.
For the rest, thank you for the links and the time but that only explains how the compression works.
If you want to know you could do fourier transform and see which kind of signals are cut out in one for example.
For most of the images that I tried you can only see differences with the images side by side. It's really subtle.
I do have one example for which my config must be bad, compresses a lot but introduces a lot of noise
I don't know if the client is the issue, but I am using the Voyager android app and this image failed to load
Works for me with Voyager on mobile.
Now that I view your reply it loaded. It seemed to be another problem. Sometimes images just don't want to load
In case you still can't load the image, for the largest width the JPG file has 229.9KB, WEBP has 123.5KB, AVIF has 72KB.