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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.
ICNS at a glance
ICNS
ICNS reflects the Mac graphics-resource tradition where a single icon asset is really a packaged set of representations for one application or object identity.
Format comparison
| Feature | PGM | ICNS |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 1988 | 2000 |
| Inventor | Jef Poskanzer / Netpbm lineage | Apple |
| Status | active | proprietary |
| 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 ICNS.
- PGM is commonly used in image workflows.
When to use ICNS
- Your target workflow expects ICNS.
- Improve delivery compatibility with ICNS.
- ICNS is commonly used in image workflows.
FAQs
Why convert PGM to ICNS?
Convert to ICNS when creating or updating macOS application icons or preserving Apple-specific icon assets.
It is the correct target when a Mac application bundle or desktop asset workflow expects native icon resources.
What changes when converting PGM to ICNS?
This conversion changes how the format behaves in downstream tools and delivery environments.
What should I review after converting PGM to ICNS?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.