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JPEG 2000 at a glance
JPEG 2000
JPX reflects the branch of JPEG 2000 that pushed beyond a simple still-image wrapper into more expressive composition and metadata scenarios for professional and institutional imaging.
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.
Format comparison
| Feature | JPEG 2000 | PEF |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
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| Created year | 2004 | 2006 |
| Inventor | ISO/IEC (JPEG committee) | Pentax (now Ricoh) |
| Status | active | proprietary |
| Transparency | Not supported | Not supported |
| Animation | Supported | Not supported |
| Primary use cases |
|
|
| Layer support | Not supported | Not supported |
| Vector scaling | Not supported | Not supported |
| Camera raw data | Not supported | Supported |
| HDR support | Not supported | Not supported |
| Streaming ready | Not supported | Not supported |
When to use each format
When to use JPEG 2000
- Your source file is already in JPEG 2000.
- Preserve source expectations before exporting to PEF.
- JPEG 2000 is commonly used in image workflows.
When to use PEF
- Your target workflow expects PEF.
- Improve delivery compatibility with PEF.
- PEF is commonly used in image workflows.
FAQs
Why convert JPEG 2000 to PEF?
Convert to PEF when preserving Pentax camera originals or maintaining a Pentax-oriented raw workflow.
It is useful for archive masters and editable photographic captures.
What changes when converting JPEG 2000 to PEF?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to PEF removes animation support. Moving to PEF adds camera raw data.
What should I review after converting JPEG 2000 to PEF?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.