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EXR at a glance
EXR
OpenEXR came from film-production needs at ILM and then evolved into an open industry format that spread across rendering, compositing, and broader high-end image pipelines.
HDR at a glance
HDR
HDR raster formats became important in rendering and lighting workflows before consumer-facing HDR delivery stories matured in mainstream media formats.
Format comparison
| Feature | EXR | HDR |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
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| Created year | 2003 | 1989 |
| Inventor | Industrial Light & Magic | Greg Ward |
| Status | active | active |
| Transparency | Not supported | Not supported |
| Animation | Not supported | Not supported |
| Primary use cases |
|
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| Layer support | Not supported | Not supported |
| Vector scaling | Not supported | Not supported |
| Camera raw data | Not supported | Not supported |
| HDR support | Supported | Supported |
| Streaming ready | Not supported | Not supported |
When to use each format
When to use EXR
- Your source file is already in EXR.
- Preserve source expectations before exporting to HDR.
- EXR is commonly used in image workflows.
When to use HDR
- Your target workflow expects HDR.
- Improve delivery compatibility with HDR.
- HDR is commonly used in image workflows.
FAQs
Why convert EXR to HDR?
Convert to HDR when you need scene-referred high-dynamic-range image data for rendering, environment lighting, or technical HDR processing.
It is useful for lighting assets and specialized imaging pipelines.
What changes when converting EXR to HDR?
This conversion changes how the format behaves in downstream tools and delivery environments.
What should I review after converting EXR to HDR?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.