Need a little more pop to your Slack emoji? Want to really stand out when you react with your favorite image?
Turns out you can add HDR emoji to Slack, and they will be rendered in eye-searing brightness, at least on hardware
that supports it. Works great in Chrome and Slack, and not at all on Android devices.
Examples:
Note: These examples will work best when posted to Slack. Support in browsers and on devices varies, YMMV.
Known to w
21 Comments
jchw
Looks like this works on Chrome for Android, but Firefox doesn't seem to support HDR at all.
https://bugzil.la/hdr
Maybe some day.
Groxx
This might be the best use of HDR I've ever seen.
And will continue to see for quite some time when my eyes are closed.
lxgr
For more information on the different ways to encode HDR content in images, together with examples for each, I've found this article very useful: https://gregbenzphotography.com/hdr/
And this explains how Apple implements this feature on non-OLED/mini-LED screens (and, in my observation, at least still to some extent even on mini-LED): https://prolost.com/blog/edr
joshuaturner
Time to make my Slack profile pic really stand out
globular-toast
Interesting, my phone seems to do some normalisation, I presume rather than clip the image. So it turns "down" the rest of the page leaving the emojis bright. I wonder which part of the system is doing this. Chrome on Android.
Jeremy1026
> Works great on iPhones
Funnily enough, on my iPhone I'm getting the blue box question mark instead of the images on the page.
muglug
Can confirm that this works, and can also confirm that people who post glaring HDR images to Slack are frequently peer-pressured to remove them shortly thereafter by everyone in the channel.
ionwake
Sorry for the noob question but I think finally someone in this thread can answer this for me. Sometimes when I see a youtube short video it looks like its HDR is whacked up by like 500% as per the image in this page, but Im confused how this could be done. Is video processing on the video before it is uploaded somehow giving it some sort of encoding which chrome just wacks up? Or is it the hardware doing it and encoding it a certain way?
I am not talking about a slight brightness increase, I am talking Ill be scrolling youtube and suddenly this video is like a portal into another dimension its so bright.
Can anyone explain how its done?
recursive
I don't think I understand HDR. It just looks brighter and more contrast. I can just do that with normal manipulations. What's this all about?
Edit: Maybe my hardware doesn't support it. I'm using an LG monitor with Windows. There's also a good chance I've never actually seen anything in HDR.
donohoe
I used (abused) HDR in an editorial project last year. We were working with an amazing illustrator doing a take on series of stories exploring the intersection of faith, storytelling, and technology.
As the early versions of the images emerged we thought we could used HDR to provide more or a aura to some elements. We tried to make it subtle and not overwhelm.
This example is my favorite:
https://restofworld.org/2024/divinity-altered-reality-muslim…
I think it worked well – and this technique would have been useful. We tried something similar but could not get it to work.
Our method was to use a stretched HDR video in the background.
Here are the steps I used:
In Photoshop create white image to proportions required. Save as MP4:
Save as "sample.mp4"
With the MP4, generate a HDR version in WEBM:
With the plain MP4, generate the HDR version:
dmd
To forestall confusion: If the smiley face on the right is not much much brighter than the page background (which is #ffffff), then your hardware does not support this and you are not seeing what others are seeing.
jessewilson
Instructions on turning ’em off: https://github.com/swankjesse/hdr-emojis
1970-01-01
Thanks, I hate it.
ChrisArchitect
HDR-Infused Slack emoji that is, not unicode emojis.
dangoodmanUT
HDR is terrible
The fact that you can't turn it off system wide shows the macOS leadership is asleep at the wheel
LoganDark
Fun fact: On "XDR displays" (such as recent MacBook Pros and also Apple's new Studio Display XDR), you can actually decrease the display brightness to see more dynamic range.
Here is a recording of this happening for those who can't experience it for for themselves:
https://logandark.net/files/2QN2R1P3-26295O2O-9045N31P-P2POQ… (6.7 MB / 6.4 MiB)
(sorry for the terrible quality, it was a very lazy recording)
nialv7
> Works great in Chrome and Slack, and not at all on Android devices.
Hurmm it does work for me in Chrome on Android.
Spunkie
Doesn't seem to work at all on linux in any browser I test. My laptop and distro support HDR and it's turned on.
A_Duck
Here are all the emojis in HDR format, ready to import to Slack
My apologies to your co-workers
https://we.tl/t-CV83O4r74f
MasterScrat
More HDR shenanigans from some time ago: https://news.ycombinator.com/item?id=36389285
Demo: https://notes.dt.in.th/HDRQRCode
Interestingly that one worked on iPhone, while the new emojis one doesn't
MasterScrat
On MacOS, if you toggle the OS from dark to light mode and back, you can see for a second the HDR effect being turned off