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Image MIME Reference
AVIF

AV1 Image File Format

image/avif
VS

Kodak K25 Raw Image

image/x-kodak-k25
Kodak-K25

A complete technical comparison of AV1 Image File Format and Kodak K25 Raw Image — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

AVIF wins on browser support

Feature Support

Feature AVIF Kodak-K25
Transparency (Alpha) Yes ✕ No
Animation Support Yes ✕ No
Progressive Loading ✕ No ✕ No
HDR Support Yes Yes
EXIF Metadata Yes Yes
ICC Color Profile Yes ✕ No
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 →
Kodak K25 Raw Image
image/x-kodak-k25
Extension
.k25
Container Proprietary Kodak Raw (TIFF-based variant)
Compression Uncompressed / Proprietary Lossless
Algorithm
Proprietary Kodak Compression
Color Depth 10-bit, 12-bit (Per Channel)
Developed by Eastman Kodak Company
Released 1996
Magic Bytes
Varies (Often resembles TIFF header 49 49 2A 00 or requires proprietary parsing)
Full Kodak-K25 reference →

Browser Support Comparison

Browser AVIF Kodak-K25
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
Kodak-K25

Kodak-K25 Strengths

  • Historically significant format tied to the first digital camera to adopt CompactFlash memory
  • Preserves original raw sensor data, allowing modern demosaicing algorithms (via LibRaw) to extract much better image quality than 1996-era software could
Limitations
  • Completely obsolete and deeply proprietary, lacking modern raw format features found in DNG
  • Cannot be natively viewed in web browsers or standard operating system image viewers without specialized decoders
  • Subject to misidentification by automated MIME detection libraries due to structural similarities with standard TIFFs

When to choose which format

AVIF
Use AVIF when…
  • Next-Gen Websites
  • HDR Photography
  • High-Quality Web Images
Kodak-K25
Use Kodak-K25 when…
  • Vintage Digital Photography Archival
  • Kodak DC25 Camera Restorations
  • Historical Imaging Research

More comparisons

AVIF vs ACES → Kodak-K25 vs ACES → AVIF vs APNG → Kodak-K25 vs APNG → AVIF vs AVCI → Kodak-K25 vs AVCI → AVIF vs AVCS → Kodak-K25 vs AVCS → All comparisons →
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