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Image MIME Reference
JPEG-AI-Sequence

JPEG AI Image Sequence

image/jais
VS

Kodak K25 Raw Image

image/x-kodak-k25
Kodak-K25

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

Equal browser support

Feature Support

Feature JPEG-AI-Sequence Kodak-K25
Transparency (Alpha) Yes ✕ No
Animation Support Yes ✕ No
Progressive Loading Yes ✕ No
HDR Support Yes Yes
EXIF Metadata Yes Yes
ICC Color Profile Yes ✕ No
JPEG AI Image Sequence
image/jais
Extension
.jais
Container ISOBMFF / HEIF Image Sequence
Compression Lossy (Variational Autoencoder / Neural Network)
Algorithm
Deep Neural Network (Variational Autoencoder with Hyperpriors)
Color Depth 8-bit, 10-bit, 12-bit, 16-bit, Wide-gamut & HDR
Developed by Joint Photographic Experts Group (ISO/IEC JTC 1 / ITU-T)
Released 2025
Magic Bytes
.. .. .. .. 66 74 79 70 6A 61 69 73 (Size + ftypjais)
Full JPEG-AI-Sequence 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 JPEG-AI-Sequence Kodak-K25
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕ ✕
Edge Edge
✕ ✕
IE IE (Legacy)
✕ ✕
JPEG-AI-Sequence

JPEG-AI-Sequence Strengths

  • Extends the state-of-the-art compression efficiency of JPEG AI to multi-frame image sequences and short animations
  • Allows machine vision algorithms to process temporal sequences (like surveillance bursts) directly in the compressed latent domain, saving immense computational power
  • Utilizes the robust, industry-standard ISOBMFF container for metadata, timing, and multi-track encapsulation
Limitations
  • Lacks native decoding support in current web browsers, operating systems, and video players
  • Decoding neural-network-compressed sequences requires significant compute overhead on hardware lacking dedicated AI accelerators (NPUs/GPUs)
  • Adoption is hindered by competition with established sequence formats like AVIF, HEVC (HEICS), and modern video codecs
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

JPEG-AI-Sequence
Use JPEG-AI-Sequence when…
  • Machine Vision and AI Video/Burst Workflows
  • Cloud Storage Animation Optimization
  • Focal Stacks and Medical Volumetric Slices
  • Visual Surveillance Sequences
Kodak-K25
Use Kodak-K25 when…
  • Vintage Digital Photography Archival
  • Kodak DC25 Camera Restorations
  • Historical Imaging Research

More comparisons

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