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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.
JXR at a glance
JXR
JPEG XR grew from Microsoft's HD Photo work and then moved through standards bodies, but it remained much more niche than formats such as JPEG, PNG, or later AVIF/WebP families.
Format comparison
| Feature | PGM Raw | JXR |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 1988 | 2009 |
| Inventor | Jef Poskanzer | Microsoft |
| 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 | Not supported | Not supported |
| Streaming ready | Not supported | Not supported |
When to use each format
When to use PGM Raw
- Your source file is already in PGM Raw.
- Preserve source expectations before exporting to JXR.
- PGM Raw is commonly used in image workflows.
When to use JXR
- Your target workflow expects JXR.
- Improve delivery compatibility with JXR.
- JXR is commonly used in image workflows.
FAQs
Why convert PGM Raw to JXR?
Convert to JXR when the receiving environment explicitly expects JPEG XR or when recovering historical assets from that ecosystem.
For broader distribution, TIFF, PNG, AVIF, or WebP are usually easier choices.
What changes when converting PGM Raw to JXR?
This conversion changes how the format behaves in downstream tools and delivery environments.
What should I review after converting PGM Raw to JXR?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.