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EPUB at a glance
EPUB
EPUB grew out of the digital publishing standards ecosystem and later moved under W3C stewardship, reinforcing its identity as an open publishing format rather than a vendor-specific storefront file.
CRW at a glance
CRW
Early Canon digital-camera workflows used raw formats like CRW before the later EOS raw families stabilized around CR2 and then CR3.
Format comparison
| Feature | EPUB | CRW |
|---|---|---|
| File type | Ebook | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 2007 | 2000 |
| Inventor | IDPF / W3C | Canon |
| Status | active | proprietary |
| Primary use cases |
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When to use each format
When to use EPUB
- Your source file is already in EPUB.
- Preserve source expectations before exporting to CRW.
- EPUB is commonly used in ebook workflows.
When to use CRW
- Your target workflow expects CRW.
- Improve delivery compatibility with CRW.
- CRW is commonly used in image workflows.
FAQs
Why convert EPUB to CRW?
Convert to CRW when maintaining compatibility with older Canon raw libraries or recovering historical camera originals.
In most current workflows it is a source to preserve or migrate, not a preferred new output format.
What changes when converting EPUB to CRW?
This conversion changes how the format behaves in downstream tools and delivery environments.
What should I review after converting EPUB to CRW?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.