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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.
SR2 at a glance
SR2
Early Sony raw formats reflect the transitional period in which Sony was still establishing its photography ecosystem and raw compatibility story.
Format comparison
| Feature | PGM | SR2 |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 1988 | 2003 |
| Inventor | Jef Poskanzer / Netpbm lineage | Sony |
| Status | active | proprietary |
| Transparency | Not supported | Not supported |
| Animation | Not supported | Not supported |
| Primary use cases |
|
|
| Layer support | Not supported | Not supported |
| Vector scaling | Not 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 PGM
- Your source file is already in PGM.
- Preserve source expectations before exporting to SR2.
- PGM is commonly used in image workflows.
When to use SR2
- Your target workflow expects SR2.
- Improve delivery compatibility with SR2.
- SR2 is commonly used in image workflows.
FAQs
Why convert PGM to SR2?
Convert to SR2 when maintaining an archive of older Sony raws or preserving compatibility with an earlier Sony camera workflow.
In most modern pipelines it is a source or recovery target rather than a preferred new output.
What changes when converting PGM to SR2?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to SR2 adds camera raw data.
What should I review after converting PGM to SR2?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.