UltraHDR JPEG Explained
Understand what UltraHDR JPEG is, how gain maps work, and when to use UltraHDR in browser-based image workflows.
What UltraHDR adds to JPEG
UltraHDR JPEG combines a standard-looking image representation with extra HDR-related information, typically through a gain map. That allows compatible viewers to display richer highlights while fallback systems still show an SDR-compatible image.
This matters because it lowers the friction of HDR delivery compared with asking every workflow to adopt a completely different file format.
Why gain maps matter
A gain map describes how brighter HDR presentation can be reconstructed relative to a base image. It gives one file a better chance of working across both standard and HDR-aware viewing environments.
For production teams, the practical question is whether preview, export, and compatibility settings align with the viewers and devices that will actually consume the image.
When to use a browser tool
A browser-based UltraHDR tool is useful for quick inspection, preset validation, and SDR/HDR comparison without a heavier imaging stack. It helps answer whether a gain-map based export behaves as expected before the file goes into broader distribution.
If the workflow also includes EXR or HDR intermediates, it is often helpful to validate those sources first and then confirm the final UltraHDR output as a separate delivery step.