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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.
PTX at a glance
PTX
Digital photography fragmented into many manufacturer-specific raw formats because camera makers optimized for their own sensors, metadata, and software ecosystems rather than for one shared public raw standard.
Format comparison
| Feature | ICO | PTX |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 1985 | 2005 |
| Inventor | Microsoft | Pentax (now Ricoh) |
| 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 | 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 PTX.
- ICO is commonly used in image workflows.
When to use PTX
- Your target workflow expects PTX.
- Improve delivery compatibility with PTX.
- PTX is commonly used in image workflows.
FAQs
Why convert ICO to PTX?
Convert to PTX when preserving compatibility with an existing proprietary capture archive or working inside a specialist workflow that still expects it.
It is mainly an archival and migration format.
What changes when converting ICO to PTX?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to PTX adds camera raw data.
What should I review after converting ICO to PTX?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.