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PNM at a glance
PNM
Convert to PNM when you need a plain, easily processed raster format for scripts, research, or utility pipelines.
It is useful as an intermediate representation in technical imaging workflows.
CAP at a glance
CAP
Convert to CAP when keeping compatibility with a legacy capture workflow or preserving source material from a proprietary imaging system.
It is mainly useful in archive recovery and controlled migration scenarios.
Format comparison
| Feature | PNM | CAP |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
|
| Compression / quality | depends | raw |
| File size characteristics | medium | large |
| Compatibility | broad | limited |
| Editability | moderate | high |
| Created year | 1988 | 2005 |
| Inventor | Jef Poskanzer / Netpbm lineage | Phase One |
| Status | active | proprietary |
| Transparency | Not supported | Not supported |
| Animation | Not supported | Not supported |
| Primary use cases |
|
|
| Common software |
|
|
| Archival suitability | moderate | strong |
| Metadata handling | moderate | rich |
| Delivery profile | strong | limited |
| Workflow fit | delivery | source |
| 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 PNM
- capture ingest
- editing
- web or print delivery
- Very simple to parse and generate.
When to use CAP
- capture ingest
- editing
- web or print delivery
- Preserve capture-stage image data for later interpretation.
FAQs
Why convert PNM to CAP?
Convert to CAP when keeping compatibility with a legacy capture workflow or preserving source material from a proprietary imaging system.
It is mainly useful in archive recovery and controlled migration scenarios.
What changes when converting PNM to CAP?
This conversion changes how the format behaves in downstream tools and delivery environments.
Size profile changes from medium in PNM to large in CAP. Quality profile changes from depends in PNM to raw in CAP. Editability profile changes from moderate in PNM to high in CAP. Compatibility profile changes from broad in PNM to limited in CAP. Archival profile changes from moderate in PNM to strong in CAP. Metadata profile changes from moderate in PNM to rich in CAP. Delivery profile changes from strong in PNM to limited in CAP. Workflow profile changes from delivery in PNM to source in CAP.
Moving to CAP adds camera raw data.
What should I review after converting PNM to CAP?
Check the exported file for Many are vendor-specific and poorly documented publicly.; Compatibility often depends on decoder support in tools such as LibRaw, Adobe Camera Raw, or vendor software.; They are source formats, not publication-ready outputs..