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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.
CR3 at a glance
CR3
CR3 marks Canon's move into a newer raw-file generation as mirrorless and later-camera workflows evolved beyond the long CR2 era.
Format comparison
| Feature | EPUB | CR3 |
|---|---|---|
| File type | Ebook | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 2007 | 2018 |
| 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 CR3.
- EPUB is commonly used in ebook workflows.
When to use CR3
- Your target workflow expects CR3.
- Improve delivery compatibility with CR3.
- CR3 is commonly used in image workflows.
FAQs
Why convert EPUB to CR3?
Convert to CR3 when preserving current Canon camera originals or exchanging material with workflows built around Canon's recent raw ecosystem.
It is appropriate for archive masters and non-destructive photographic editing.
What changes when converting EPUB to CR3?
This conversion changes how the format behaves in downstream tools and delivery environments.
What should I review after converting EPUB to CR3?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.