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FITS at a glance
FITS
FITS became a durable scientific standard because observatories, spacecraft, and analysis tools needed a stable interchange format that outlived individual instruments and software stacks.
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 | FITS | ICNS |
|---|---|---|
| File type | Image | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 1981 | 2000 |
| Inventor | NASA / astronomical data community | 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 FITS
- Your source file is already in FITS.
- Preserve source expectations before exporting to ICNS.
- FITS 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 FITS 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 FITS to ICNS?
This conversion changes how the format behaves in downstream tools and delivery environments.
What should I review after converting FITS to ICNS?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.