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PGM at a glance
PGM
PBM, PGM, PPM, PNM, and later PAM come from the tool-centric tradition of keeping image interchange formats easy to parse, script, and transform.
VST at a glance
VST
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 | PGM | VST |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 1988 | 1987 |
| Inventor | Jef Poskanzer / Netpbm lineage | 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 PGM
- Your source file is already in PGM.
- Preserve source expectations before exporting to VST.
- PGM is commonly used in image workflows.
When to use VST
- Your target workflow expects VST.
- Improve delivery compatibility with VST.
- VST is commonly used in image workflows.
FAQs
Why convert PGM to VST?
Convert to VST only when preserving or recovering early Truevision graphics assets in their original form, or when bridging those files into a contemporary raster format for access and restoration.
What changes when converting PGM to VST?
This conversion changes how the format behaves in downstream tools and delivery environments.
What should I review after converting PGM to VST?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.