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CR2 at a glance
CR2
CR2 became the dominant Canon raw family through the long DSLR era, so huge real-world photo archives still depend on stable CR2 decoding and migration paths.
PGM at a glance
PGM
PBM, PGM, PPM, PNM, and later PAM come from the tool-centric tradition of keeping image interchange formats easy to parse, script, and transform.
Format comparison
| Feature | CR2 | PGM |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 2004 | 1988 |
| Inventor | Canon | Jef Poskanzer / Netpbm lineage |
| Status | proprietary | active |
| Transparency | Not supported | Not supported |
| Animation | Not supported | Not supported |
| Primary use cases |
|
|
| Layer support | Not supported | Not supported |
| Vector scaling | Supported | Not supported |
| Camera raw data | Supported | Not supported |
| HDR support | Not supported | Not supported |
| Streaming ready | Not supported | Not supported |
When to use each format
When to use CR2
- Your source file is already in CR2.
- Preserve source expectations before exporting to PGM.
- CR2 is commonly used in image workflows.
When to use PGM
- Your target workflow expects PGM.
- Improve delivery compatibility with PGM.
- PGM is commonly used in image workflows.
FAQs
Why convert CR2 to PGM?
Convert to PGM when you need a straightforward grayscale raster for scripting, research, or low-overhead image processing.
It is a good target for technical pipelines and intermediate data exchange.
What changes when converting CR2 to PGM?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to PGM removes vector scaling. Moving to PGM removes camera raw data.
What should I review after converting CR2 to PGM?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.