this post was submitted on 05 Dec 2023
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why does the poster image of c/linux have 3.8mb? (programming.dev)
submitted 11 months ago by juli@programming.dev to c/linux@lemmy.ml
26 comments fedilink hide all child comments
 

This is the link to the image. It has 3.8mb. In my opinion that is way too much.

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[–] yote_zip@pawb.social 39 points 11 months ago (3 children)

Everyone fully missing the point here. This is the banner image for !linux@programming.dev (that's not where we are right now for the record), and it has a normal JPEG size of 7.7MB. When it's served as WebP it's 3.8MB. OP is correct that this is very stupid and wasteful for a web content image. It's a triple-monitor 1440p wallpaper that's used verbatim, and it should instead be compressed down to be bandwidth-friendly. I was able to get it to 1.4MB at JPEG quality 80, and when swapping it out in dev tools and performing A/B testing I can't tell the difference. This should be brought to the attention of a mod on that community so it can stop sucking people's data for no reason.

[–] cmnybo@discuss.tchncs.de 5 points 11 months ago

It could be resized too. 5120x1440 is way too big for a website banner. There's no reason to go more than double the size it will actually be displayed at. That would bring it down to a couple hundred KB.

[–] juli@programming.dev 4 points 11 months ago

Thank you!

[–] kglitch@kglitch.social 3 points 11 months ago

I got it to 47 KB after resizing it to 850px by 239px, heh

[–] teawrecks@sopuli.xyz 4 points 11 months ago (1 children)

Which are you suggesting?

  • that the image could be losslessly compressed more efficiently?
  • that lossy compression should be used more aggressively?
  • that there is extra data hidden in the file?
[–] _edge@discuss.tchncs.de 10 points 11 months ago (2 children)

It's 5120 px wide. Is this necessary?

[–] gregorum@lemm.ee 4 points 11 months ago* (last edited 11 months ago)

it's not. the lemmy-ui max width for the poster element is far smaller than that (1104x960). in fact, the poster element is set to be a near-square (displays as rectangular in web and mobile web on the page header), as it also displays in the sidebar and in mobile apps as a square if the image is. most mods simply assume it's a rectangle and upload a rectangular image.

this image is made to be the largest usable resolution lemmy can display as a community poster and optimized to be very small in file size. see on https://lemm.ee/c/plex

[–] teawrecks@sopuli.xyz -2 points 11 months ago (2 children)

That's a question for a web developer, which I am not. I would expect it to be the max common resolution width. A quick Google shows that modern ultrawides are 5120x1440. So that's probably why.

[–] kglitch@kglitch.social 5 points 11 months ago* (last edited 11 months ago)

I'm a web developer.

Lemmy does not use the entire screen width. The way it has been embedded in the page means that image takes up only 850 pixels of horizontal space so it could be 5x smaller and no one would be able to see the difference.

Lemmy really should be automatically resizing the images (on the server) when they are uploaded, not every single time the community is viewed (in the browser).

[–] Deckweiss@lemmy.world 1 points 11 months ago* (last edited 11 months ago) (1 children)

So if you are not a cook, you can't answer questions about food taste?

[–] teawrecks@sopuli.xyz 1 points 11 months ago (1 children)

I mean, I took a guess. I don't know what you want from me.

[–] Deckweiss@lemmy.world 1 points 11 months ago

I want you to laugh at my joke question.

[–] themusicman@lemmy.world 2 points 11 months ago

The issue is not that the large image was uploaded. The server should always store the highest quality available, and serve whatever resolution is requested by the client.

I consider this a bug with Lemmy

[–] BarrierWithAshes@kbin.social 1 points 11 months ago

Well what size should it be? Should it be converted to JXL since it compresses better?

[–] zingo@lemmy.ca 0 points 11 months ago

Interesting!

[–] 0x4E4F@infosec.pub 0 points 11 months ago

It's grainy. Grain always takes a lot in size.

[–] stoy@lemmy.zip -1 points 11 months ago (3 children)

Sorry for being a bit of a dick, I think you mean that the file "is 3.8MB".

"mb" would mean millibit, 3.8millibit is an impossibly small file size, and would never exist practically (though I an sure that with some clever maths a zip bomb could be designed so that one bit of data could be compressed into 3.8millibits)

MB is the proper shorthand for MegaByte, a decent file size for a high quallity pucture, depending on the format and compression.

Unless we analyze the image, and determine the image format and compression settings we have no idea of if 3.8MB is a resonable size of the file or not, and the mods have hidden a rar file in the picture file, it is highly improbable that would be the case however.

Sorry for being a dick.

[–] kpw@kbin.social 9 points 11 months ago (2 children)

Please stop purposefully misunderstanding people when the thing their trying to say is clear. Most annoying character trait one could have.

[–] explore_broaden@midwest.social 3 points 11 months ago

It leads to genuine confusion because of the difference between Mb and MB (and further MiB), so this is a good point to make in this case.

[–] stoy@lemmy.zip 2 points 11 months ago

This is all fair, I can't say it wont happen again ever, but I usually am not this kind of a dick.

[–] governorkeagan@lemdro.id 4 points 11 months ago (1 children)

I’ll add some context for anyone who might be interested.

why does the poster image of c/linux have 3.8mb?

When speaking Portuguese (possibly Spanish as well) you would say it like this, a imagem tem….

It is quite common for native speakers of Portuguese (and probably Spanish) mix this up when speaking English.

source: I speak Portuguese

[–] _edge@discuss.tchncs.de 1 points 11 months ago (1 children)

OP does not argue about 'has' vs 'is'.

[–] governorkeagan@lemdro.id 1 points 11 months ago* (last edited 11 months ago)

I’m just adding useful extra information to the thread.

Sorry for being a bit of a dick, I think you mean that the file "is 3.8MB".

The sentence I was referring to in my original comment.

Edit: added context

[–] juli@programming.dev 2 points 11 months ago (1 children)

I was just lazy, but thx for the explanation and the importance of correct spelling

[–] stoy@lemmy.zip 4 points 11 months ago

Eh, you should not have had to deal with that, I was just annoyed about other stuff and should have ignored the post instead of being a dick.

I am sorry for my bad post.

[–] tutus@links.hackliberty.org -2 points 11 months ago

Ok.