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Growth · August 28, 2026

Gainmaps.com – Stunning colors for UI

Convert text and images to “Ultra” mode, aka HDR gain maps

What it does

Saw this effect, learned about the effect, built tools so you can do it too. It was concerning to see how we missed this effect for so long. It was tied up with HDR, but the whole point is that milage may vary when it comes to the actual implementation and display. Gain maps is the key and this will move us there as an industry. Since there’s many names for this effect, I’m trying to trend that we call it “ultra,” ultra text, ultra images, and ultra dark mode. Join me on this journey!

Convert photos to HDR gain map images instantly in your browser. Local and private — no upload, no server.

The original, gain map encoded. Standard reads the SDR base. Ultra lifts the highlights. Same text, same display — left is SDR white, right is Ultra. Drop any photo or logo. We add a gain map layer and return it to you instantly — same file format, no upload, no account, no registration. Completely private, runs in your browser. Make your logo or photos look spectacular on HDR displays. Be the hero at your company. HDR is an expanded brightness range: image highlights can sit above the SDR ceiling. A gain map image encodes a normal SDR image plus a secondary brightness map. Unsupported apps render the SDR layer and ignore the rest. EDR is Apple's term for displaying brightness above SDR…from gainmaps.com

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