fp.

I dug in and found out this is accomplished by adding a gain-map to an existing JPEG, visible only on HDR screens like a newer MacBook Pro. LinkedIn is the only social network I've found that isn't stripping them out, but of course you serve them up on your own site.

I worked with Claude Code to turn it into a little browser-based utility (no registration) and hope you find it useful!

Comments

froh42•1h ago

Oooh fuuuuuuck. Do we now have the HDR screen version of the 90s/00s CD volume wars? MAX IT OUT?!? BE LOUDER! BE BRIGHTER! WTF.

leni536•1h ago

It goes up to 11

telecuda•11m ago

"It's such a fine line between stupid, and uh" ... "Clever."

madaxe_again•33m ago

Our new brand awareness strategy involves firing high power lasers directly into the prospect’s eyes, burning the logo into the centre of their fovea.

This way we get to skip awareness, interest and desire and get the prospect straight to action.

Stitch4223•1h ago

This is fun and will try to embed it in our project next week.

layer8•27m ago

Please don’t. Your profile states that you’re an ethical hacker.

dylan604•1h ago

I just noticed something similar today as an ad where the green oval button was so bright that the rest of the white screen felt grayish/dull than white. It could not be unnoticed playing on the notion that the eye is attracted to the brightest thing on the screen

jonplackett•1h ago

Please don’t do this.

You know it will be annoying.

masklinn•1h ago

On the other hand it’s a great signal that whoever uses that is an obnoxious twat and should be plonked.

fjlunky•1h ago

Pretty sure Fifth Star Labs’ Sky Guide iOS icon does this. Not the whole icon, just the stars in it. Hiding the app in a folder helps but I’m looking for a better alternative just because of this.

pbhjpbhj•1h ago

Uninstall the app? Leave a review, tell the developer.

layer8•31m ago

As a workaround, you can use a home screen shortcut to start the app.

But I agree that app developers shouldn’t do this, or should at least provide an option to turn it off. (Some apps allow customizing the app icon color, so it seems that should be possible.)

telecuda•1h ago

I mean, use it responsibly. Of course people won't, it's the internet, but a skilled designer may use it to highlight a word or an accent to draw your eye. It can be tricky in dense interfaces to draw focus to something (little tooltips or big buttons aren't the best answers). This is just another tool in the toolbox.

perryizgr8•1h ago

The page says it should work on my phone but it doesn't. No difference between the SDR and HDR versions on my phone (S26 Ultra / Chrome).

Jaxan•1h ago

It also depends on your screen brightness. In my case, if it’s set to maximum, there is no difference between SDR and HDR.

mattlondon•58m ago

Came here to say this. It just cranks the brightness up for the pixels. But if you are already at 100% there is not much headroom so all the "before and after" for me were pretty hard to differentiate. There was some minor difference if I studied it closely but I'd probably not notice it during normal use it was so slight.

If I went down to say 50% brightness then it was much more pronounced, but who lives their life with their eyes only half open like that?!

telecuda•55m ago

That's what I'm finding as I researched it:

Android's HDR brightness slider is low - The single most common "HDR does nothing" report on Android 15/16 devices. Samsung also has Super HDR/Extra brightness / Vision booster toggles under Display. Any of them at the conservative setting would have an effect.

telecuda•1h ago

I was only able to test it on my iPhone. Let me see if the S26 needs a tweak (or confirm if it's not support)

telecuda•1h ago

Works for text too!

anigbrowl•1h ago

> Every social network strips these tags except the worst one

> Clearly we need more of it

I do not in fact want sites trying to get around my display preferences to post their visual presence on screen.

sbustelo•1h ago

It seems you have seen the same logo in LinkedIn that I did :)

https://www.bustelo.com.ar/apps/superbright/index.en.php

opengrass•1h ago

Waddabout an ImageMagick command or explanation how to export in Inkscape?

daigoba66•1h ago

I’ve noticed this trend on LinkedIn just recently. Very noticeable at night, obviously, when my screen is naturally more dim. But these logos are like blinding headlights.

uhoh-itsmaciek•1h ago

In Firefox, the page tells me neither my browser nor my display support HDR. In Chrome, it works fine. Latest browsers on a Pixel 8.

nvr219•1h ago

I noticed this as well on Firefox and I say, good, please don't fix.

varun_ch•1h ago

If you use HDR videos, you can get bright white even on soon browsers that don’t support HDR images

keane•54m ago

For an authoritative overview of high dynamic range on monitors, I recommend the 137 minute documentary Debunking HDR (Steve Yedlin, 2025) https://news.ycombinator.com/item?id=44248968

kccqzy•50m ago

I hate gain maps in JPEGs. I noticed that because I insisted on capturing JPEGs and not HEIF on my iPhone, and I found that the iPhone would also show overexposed parts (such as the sky) brighter than plain white. That's how I came to know gain maps. Fortunately on iOS, although I cannot disable the inclusion of gain maps in photos I take with Camera.app, I can stop Photos.app from rendering them: just turn off "View Full HDR" in the settings.

The Metapho app on iOS seems to be a good app to view the gain map itself. I give it no access to my photos and use the share sheet to view gain maps of specific images.

DonHopkins•27m ago

Now how can I draw Vantablack text on HD white for the highest possible contrast?

https://en.wikipedia.org/wiki/Vantablack