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J2K at a glance
J2K
JPEG 2000 arrived as a major standards effort to improve on classic JPEG, but its practical adoption concentrated in specialist domains rather than in the universal browser-and-camera role held by JPEG.
SRF at a glance
SRF
Before ARW became the better-known Sony raw family, Sony's raw ecosystem already included older variants that modern tools still need to decode correctly.
Format comparison
| Feature | J2K | SRF |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 2000 | 2003 |
| Inventor | Joint Photographic Experts Group | Sony |
| Status | active | proprietary |
| 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 | 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 J2K
- Your source file is already in J2K.
- Preserve source expectations before exporting to SRF.
- J2K is commonly used in image workflows.
When to use SRF
- Your target workflow expects SRF.
- Improve delivery compatibility with SRF.
- SRF is commonly used in image workflows.
FAQs
Why convert J2K to SRF?
Convert to SRF when preserving older Sony originals or keeping a legacy Sony raw library intact.
It is useful for archive recovery and compatibility workflows.
What changes when converting J2K to SRF?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to SRF removes vector scaling. Moving to SRF adds camera raw data.
What should I review after converting J2K to SRF?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.