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CAP at a glance
CAP
Digital photography fragmented into many manufacturer-specific raw formats because camera makers optimized for their own sensors, metadata, and software ecosystems rather than for one shared public raw standard.
PPM at a glance
PPM
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 | CAP | PPM |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
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| Created year | 2005 | 1988 |
| Inventor | Phase One | 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 | Not 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 CAP
- Your source file is already in CAP.
- Preserve source expectations before exporting to PPM.
- CAP is commonly used in image workflows.
When to use PPM
- Your target workflow expects PPM.
- Improve delivery compatibility with PPM.
- PPM is commonly used in image workflows.
FAQs
Why convert CAP to PPM?
Convert to PPM when a technical workflow needs a simple RGB raster format for processing, benchmarking, or intermediate conversion.
It is useful in command-line and research-oriented image pipelines.
What changes when converting CAP to PPM?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to PPM removes camera raw data.
What should I review after converting CAP to PPM?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.