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PSB at a glance
PSB
Photoshop's native format became one of the de facto interchange anchors of raster design and retouching, even outside Adobe-only teams, because so many creative pipelines converged around its feature set.
PNM Raw at a glance
PNM Raw
PNM survived because engineers kept needing a no-drama raster family for scripts, fixtures, codecs, and image-processing experiments where the format should not be the hard part.
Format comparison
| Feature | PSB | PNM Raw |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 1990 | 1988 |
| Inventor | Adobe | Jef Poskanzer |
| Status | proprietary | active |
| Transparency | Not supported | Not supported |
| Animation | Not supported | Not supported |
| Primary use cases |
|
|
| Layer support | 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 PSB
- Your source file is already in PSB.
- Preserve source expectations before exporting to PNM Raw.
- PSB is commonly used in image workflows.
When to use PNM Raw
- Your target workflow expects PNM Raw.
- Improve delivery compatibility with PNM Raw.
- PNM Raw is commonly used in image workflows.
FAQs
Why convert PSB to PNM Raw?
Convert to PNM raw when you need a no-frills lossless raster format for scripts, benchmarking, image-processing experiments, or toolchains that prefer direct pixel access with minimal container complexity.
It is especially useful as an intermediate representation between automated processing steps.
What changes when converting PSB to PNM Raw?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to PNM Raw removes layer support.
What should I review after converting PSB to PNM Raw?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.