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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.
HDR at a glance
HDR
HDR raster formats became important in rendering and lighting workflows before consumer-facing HDR delivery stories matured in mainstream media formats.
Format comparison
| Feature | XPM | HDR |
|---|---|---|
| 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 | 1989 |
| Inventor | Daniel Dardailler, Colas Nahaboo (Groupe Bull) | Greg Ward |
| 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 | 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 HDR
- capture ingest
- editing
- web or print delivery
- Supports workflows where dynamic range matters more than consumer display compatibility.
FAQs
Why convert XPM to HDR?
Choose HDR as target when you need scene-referred high-dynamic-range image data for rendering, environment lighting, or technical HDR processing.
What changes when converting XPM to HDR?
Convert to HDR when you need scene-referred high-dynamic-range image data for rendering, environment lighting, or technical HDR processing. It is useful for lighting assets and specialized imaging pipelines.
What should I review after converting XPM to HDR?
After conversion, review these destination checks: Open converted output in renderers and verify behavior on real samples; Compare output against the expected depends quality profile; Not a mainstream end-user delivery format.
How can I keep quality stable in XPM to HDR conversion?
Run representative samples, keep settings deterministic, and monitor these risks: Needs workflow-aware viewing and validation; Not a mainstream end-user delivery format; Validate destination compatibility before large-batch conversion.