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Image MIME Reference
AVIF

AV1 Image File Format

image/avif
VS

Corel Metafile Exchange

image/x-cmx
Corel-CMX

A complete technical comparison of AV1 Image File Format and Corel Metafile Exchange — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

AVIF wins on browser support

Feature Support

Feature AVIF 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
AV1 Image File Format
image/avif
Extension
.avif
Container HEIF / ISOBMFF
Compression AV1 Lossy / AV1 Lossless
Algorithm
AV1
Color Depth 8-bit, 10-bit, 12-bit
Developed by Alliance for Open Media (AOMedia)
Released 2019
Magic Bytes
XX XX XX XX 66 74 79 70 61 76 69 66
Full AVIF reference →
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
Full Corel-CMX reference →

Browser Support Comparison

Browser AVIF Corel-CMX
Chrome Chrome
✓ 85+
 ✕
Firefox Firefox
✓ 93+
 ✕
Safari Safari
✓ 16+
 ✕
Edge Edge
✓ 121+
 ✕
IE IE (Legacy)
✕ ✕
AVIF

AVIF Strengths

  • Best-in-class compression — typically 20–50% smaller than WebP at equivalent quality
  • Native HDR and wide color gamut (BT.2020) support
  • Supports 8, 10, and 12-bit color depth
Limitations
  • Encoding is highly CPU-intensive — significantly slower than JPEG or WebP
  • Requires Edge 121+ (not supported in earlier Edge versions)
  • Limited support in native desktop image viewers
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  • Largely obsolete for modern workflows, superseded by PDF and SVG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

AVIF
Use AVIF when…
  • Next-Gen Websites
  • HDR Photography
  • High-Quality Web Images
Corel-CMX
Use Corel-CMX when…
  • Legacy CorelDRAW Clip Art Collections
  • Vector Graphic Exchange within Corel Suite
  • Historical Desktop Publishing Assets

More comparisons

AVIF vs ACES → Corel-CMX vs ACES → AVIF vs APNG → Corel-CMX vs APNG → AVIF vs AVCI → Corel-CMX vs AVCI → AVIF vs AVCS → Corel-CMX vs AVCS → All comparisons →
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