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PEF at a glance
PEF
Pentax raw workflows never dominated the mass market, but their persistence in enthusiast and specialist photo libraries gives PEF ongoing practical relevance.
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.
Format comparison
| Feature | PEF | SGI |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 2006 | 1990 |
| Inventor | Pentax (now Ricoh) | Silicon Graphics Inc. |
| Status | proprietary | legacy |
| Transparency | Not supported | Not supported |
| Animation | Not supported | Not supported |
| Primary use cases |
|
|
| Layer support | Not supported | Not supported |
| Vector scaling | Not supported | Not supported |
| Camera raw data | Supported | Not supported |
| HDR support | Not supported | Not supported |
| Streaming ready | Not supported | Not supported |
When to use each format
When to use PEF
- Your source file is already in PEF.
- Preserve source expectations before exporting to SGI.
- PEF is commonly used in image workflows.
When to use SGI
- Your target workflow expects SGI.
- Improve delivery compatibility with SGI.
- SGI is commonly used in image workflows.
FAQs
Why convert PEF to SGI?
Convert to SGI when recovering or maintaining compatibility with workstation-era graphics assets and archives.
It is useful mainly for migration, restoration, and historical graphics interoperability.
What changes when converting PEF to SGI?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to SGI removes camera raw data.
What should I review after converting PEF to SGI?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.