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ICO at a glance
ICO
ICO grew with the Windows desktop experience, where applications needed icons that scaled across shell views, toolbars, shortcuts, and later higher-DPI environments.
PGX at a glance
PGX
These formats persist in engineering, compression research, and conversion-tool contexts where simple sample storage or adjunct technical representation is useful.
Format comparison
| Feature | ICO | PGX |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 1985 | 2000 |
| Inventor | Microsoft | ISO/IEC (JPEG 2000 committee) |
| 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 ICO
- Your source file is already in ICO.
- Preserve source expectations before exporting to PGX.
- ICO is commonly used in image workflows.
When to use PGX
- Your target workflow expects PGX.
- Improve delivery compatibility with PGX.
- PGX is commonly used in image workflows.
FAQs
Why convert ICO to PGX?
Convert to PGX when a technical imaging or codec workflow expects grayscale component data in a simple specialist format.
It is useful for research, testing, and standards-oriented image processing.
What changes when converting ICO to PGX?
This conversion changes how the format behaves in downstream tools and delivery environments.
What should I review after converting ICO to PGX?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.