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FB2 at a glance
FB2
FB2 became especially visible in Eastern European ebook ecosystems, where community standards and open library habits shaped ebook distribution differently from Kindle or EPUB-first markets.
X3F at a glance
X3F
Sigma raw support is closely tied to the company's Foveon sensor story, giving X3F a reputation and workflow profile that differ from more mainstream Bayer-centric raw ecosystems.
Format comparison
| Feature | FB2 | X3F |
|---|---|---|
| File type | Ebook | Image |
| Extensions |
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| MIME type |
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| Created year | 2004 | 2002 |
| Inventor | Russian eBook community | Sigma (Foveon) |
| Status | active | proprietary |
| Primary use cases |
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When to use each format
When to use FB2
- Your source file is already in FB2.
- Preserve source expectations before exporting to X3F.
- FB2 is commonly used in ebook workflows.
When to use X3F
- Your target workflow expects X3F.
- Improve delivery compatibility with X3F.
- X3F is commonly used in image workflows.
FAQs
Why convert FB2 to X3F?
Convert to X3F when preserving Sigma camera originals or maintaining a workflow built around Foveon raw processing.
It is useful for archival retention and non-destructive editing of Sigma captures.
What changes when converting FB2 to X3F?
This conversion changes how the format behaves in downstream tools and delivery environments.
What should I review after converting FB2 to X3F?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.