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PGM Raw at a glance
PGM Raw
The raw PGM branch reflects the practical evolution of Netpbm-style tool formats: keep the tiny header and easy parsing, but move the pixel raster into a binary form that is much more usable for real data sizes.
XPM at a glance
XPM
Before today's relatively small set of mainstream consumer image formats dominated everyday use, desktop software, workstations, GUI systems, and early graphics tools produced many specialized raster formats with local importance.
Format comparison
| Feature | PGM Raw | XPM |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
|
| Compression / quality | depends | depends |
| File size characteristics | medium | medium |
| Compatibility | broad | broad |
| Editability | moderate | moderate |
| Created year | 1988 | 1989 |
| Inventor | Jef Poskanzer | Daniel Dardailler, Colas Nahaboo (Groupe Bull) |
| Status | active | legacy |
| Transparency | Not supported | Not supported |
| Animation | Not supported | Not supported |
| Primary use cases |
|
|
| Common software |
|
|
| Archival suitability | moderate | moderate |
| Metadata handling | moderate | moderate |
| Delivery profile | strong | strong |
| Workflow fit | delivery | delivery |
| Layer support | Not supported | Not supported |
| Vector scaling | Not supported | Not supported |
| Camera raw data | Not supported | Not supported |
| HDR support | Not supported | Not supported |
| Streaming ready | Not supported | Not supported |
When to use each format
When to use PGM Raw
- capture ingest
- editing
- web or print delivery
- Minimal binary grayscale format that is easy to implement.
When to use XPM
- capture ingest
- editing
- web or print delivery
- Important for long-tail compatibility and archival conversion.
FAQs
Why convert PGM Raw to XPM?
Choose XPM as target when maintaining or restoring X11-era icon assets or other historical Unix interface graphics.
What changes when converting PGM Raw to XPM?
Convert to XPM when maintaining or restoring X11-era icon assets or other historical Unix interface graphics. It is useful where text-based icon compatibility matters more than modern compression.
What should I review after converting PGM Raw to XPM?
After conversion, review these destination checks: Open converted output in ImageMagick and verify behavior on real samples; Compare output against the expected depends quality profile; Poor fit for modern mainstream publishing.
How can I keep quality stable in PGM Raw to XPM conversion?
Run representative samples, keep settings deterministic, and monitor these risks: Tool support can be uneven and workflow-specific; Poor fit for modern mainstream publishing; Validate destination compatibility before large-batch conversion.