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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.
PGX at a glance
PGX
These formats persist in engineering, compression research, and conversion-tool contexts where simple sample storage or adjunct technical representation is useful.
Format comparison
| Feature | XPM | PGX |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
|
| Compression / quality | depends | depends |
| File size characteristics | medium | medium |
| Compatibility | broad | broad |
| Editability | moderate | moderate |
| Created year | 1989 | 2000 |
| Inventor | Daniel Dardailler, Colas Nahaboo (Groupe Bull) | ISO/IEC (JPEG 2000 committee) |
| Status | legacy | active |
| 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 XPM
- capture ingest
- editing
- web or print delivery
- Important for long-tail compatibility and archival conversion.
When to use PGX
- capture ingest
- editing
- web or print delivery
- Useful for technical sample interchange and tooling.
FAQs
Why convert XPM to PGX?
Choose PGX as target when a technical imaging or codec workflow expects grayscale component data in a simple specialist format.
What changes when converting XPM to PGX?
Convert to PGX when a technical imaging or codec workflow expects grayscale component data in a simple specialist format. It is useful for research, testing, and standards-oriented image processing.
What should I review after converting XPM to PGX?
After conversion, review these destination checks: Open converted output in codec tooling and verify behavior on real samples; Compare output against the expected depends quality profile; Not intended for mainstream publishing or editing.
How can I keep quality stable in XPM to PGX conversion?
Run representative samples, keep settings deterministic, and monitor these risks: Sparse everyday application support; Not intended for mainstream publishing or editing; Validate destination compatibility before large-batch conversion.