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SGI at a glance
SGI
Before today's relatively small set of mainstream consumer image formats dominated everyday use, desktop software, workstations, GUI systems, and early graphics tools produced many specialized raster formats with local importance.
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 | SGI | HDR |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 1990 | 1989 |
| Inventor | Silicon Graphics Inc. | Greg Ward |
| Status | legacy | 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 | Not supported | Supported |
| Streaming ready | Not supported | Not supported |
When to use each format
When to use SGI
- Your source file is already in SGI.
- Preserve source expectations before exporting to HDR.
- SGI 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 SGI 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 SGI to HDR?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to HDR adds HDR content.
What should I review after converting SGI to HDR?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.