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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.
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 | HDR | PPM |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 1989 | 1988 |
| Inventor | Greg Ward | Jef Poskanzer / Netpbm lineage |
| Status | active | 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 | Not supported | Not supported |
| HDR support | Supported | Not supported |
| Streaming ready | Not supported | Not supported |
When to use each format
When to use HDR
- Your source file is already in HDR.
- Preserve source expectations before exporting to PPM.
- HDR 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 HDR 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 HDR to PPM?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to PPM removes HDR content.
What should I review after converting HDR to PPM?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.