Image MIME Reference
AIMG
Universal AI Media Format (Image)
image/prs.aimg
VS
Corel Metafile Exchange
image/x-cmx
Corel-CMX
A complete technical comparison of Universal AI Media Format (Image) and Corel Metafile Exchange — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.
Equal browser support
Feature Support
| Feature | AIMG | Corel-CMX |
|---|---|---|
| Transparency (Alpha) | Yes | Yes |
| Animation Support | Yes | ✕ No |
| Progressive Loading | ✕ No | ✕ No |
| HDR Support | Yes | ✕ No |
| EXIF Metadata | Yes | ✕ No |
| ICC Color Profile | Yes | Yes |
Universal AI Media Format (Image)
image/prs.aimg
Extension
.aimg
Container
Universal AI Media Format (AIMF)
Compression
Container (Inherits payload compression, e.g., PNG/JPEG)
Algorithm
None (Pass-through to embedded payload)
Color Depth
Inherited from payload (8-bit, 16-bit, HDR)
Developed by
AI Media Format (ai-mf) Open-Source Project
Released
2026
Magic Bytes
Varies (Custom AIMF Header Prepended to Payload)
Corel Metafile Exchange
image/x-cmx
Extension
.cmx
Container
RIFF (Resource Interchange File Format)
Compression
Uncompressed Vector Commands / Embedded Raster Compression (Optional)
Algorithm
None (Vector)
Color Depth
Vector Data, Supports embedded bitmaps
Developed by
Corel Corporation
Released
Mid-1990s
Magic Bytes
52 49 46 46 (skip 4) 43 4D 58 31
Browser Support Comparison
| Browser | AIMG | Corel-CMX |
|---|---|---|
Chrome
|
✕ | ✕ |
Firefox
|
✕ | ✕ |
Safari
|
✕ | ✕ |
Edge
|
✕ | ✕ |
IE (Legacy)
|
✕ | ✕ |
AIMG
AIMG Strengths
- Provides a robust, tamper-evident cryptographic wrapper to definitively prove the origin of AI-generated media
- Header-first structure allows verifier nodes and APIs to validate an image's origin without needing to download or decode the entire massive pixel payload
Limitations
- Lacks native rendering support in browsers, requiring server-side extraction or client-side WebAssembly to display the embedded image
- Utilizes the IANA 'prs.' (personal/vanity) tree rather than the standards tree, which can cause strict enterprise firewalls to reject the MIME type as unverified
Corel-CMX
Corel-CMX Strengths
- Preserves rich vector attributes and layer groupings native to the Corel drawing engine better than standard WMF files
- Significantly smaller footprint than full CDR project files, making it excellent for early CD-ROM clip art distribution
- Maintains decent support in the open-source community thanks to libraries like libcdr
Limitations
- Proprietary format strictly tied to Corel's ecosystem, often causing compatibility issues with Adobe software
- Zero support in web browsers; must be converted to SVG for modern web usage
- Largely obsolete for modern workflows, superseded by PDF and SVG
When to choose which format
AIMG
Use AIMG when…
- AI Provenance and Attribution
- Verifiable Deepfake Prevention
- Cryptographic Media Watermarking
- Generative AI Workflows
Corel-CMX
Use Corel-CMX when…
- Legacy CorelDRAW Clip Art Collections
- Vector Graphic Exchange within Corel Suite
- Historical Desktop Publishing Assets