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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.
ICB at a glance
ICB
The Truevision line grew out of EPICenter-era PC graphics boards, and several board names ended up surviving as filename extensions even when the underlying raster structure stayed close to the wider TGA family.
Format comparison
| Feature | PNM Raw | ICB |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 1988 | 1991 |
| Inventor | Jef Poskanzer | Truevision |
| 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 PNM Raw
- Your source file is already in PNM Raw.
- Preserve source expectations before exporting to ICB.
- PNM Raw is commonly used in image workflows.
When to use ICB
- Your target workflow expects ICB.
- Improve delivery compatibility with ICB.
- ICB is commonly used in image workflows.
FAQs
Why convert PNM Raw to ICB?
Convert to ICB when recovering historical raster assets from Truevision-era systems or normalizing old image archives before moving them into PNG, TIFF, or another contemporary format.
It is mainly a compatibility target for legacy graphics collections.
What changes when converting PNM Raw to ICB?
This conversion changes how the format behaves in downstream tools and delivery environments.
What should I review after converting PNM Raw to ICB?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.