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Image MIME Reference
HEIC-Sequence

HEVC Image Sequence (HEIF Container)

image/heic-sequence
VS

Kodak KDC Raw Image

image/x-kodak-kdc
Kodak-KDC

A complete technical comparison of HEVC Image Sequence (HEIF Container) and Kodak KDC Raw Image — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

HEIC-Sequence wins on browser support

Feature Support

Feature HEIC-Sequence Kodak-KDC
Transparency (Alpha) Yes ✕ No
Animation Support Yes ✕ No
Progressive Loading ✕ No ✕ No
HDR Support Yes Yes
EXIF Metadata Yes Yes
ICC Color Profile Yes Yes
HEVC Image Sequence (HEIF Container)
image/heic-sequence
Extension
.heics.heic
Container HEIF / ISOBMFF (ISO/IEC 14496-12)
Compression Lossy / Lossless
Algorithm
HEVC (H.265)
Color Depth 8-bit, 10-bit, 12-bit, 16-bit
Developed by Moving Picture Experts Group (MPEG) / Apple
Released 2017
Magic Bytes
XX XX XX XX 66 74 79 70 68 65 76 63
Full HEIC-Sequence reference →
Kodak KDC Raw Image
image/x-kodak-kdc
Extension
.kdc
Container TIFF/EP
Compression Uncompressed / Proprietary Lossless
Algorithm
NoneLossless JPEG (ITU-T81)Proprietary Kodak Compression
Color Depth 10-bit, 12-bit (Per Channel)
Developed by Eastman Kodak Company
Released 1995
Magic Bytes
49 49 2A 00 or 4D 4D 00 2A
Full Kodak-KDC reference →

Browser Support Comparison

Browser HEIC-Sequence Kodak-KDC
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✓ 11+
 ✕
Edge Edge
✕ ✕
IE IE (Legacy)
✕ ✕
HEIC-Sequence

HEIC-Sequence Strengths

  • Incredibly efficient storage for bursts and short animations compared to GIF or motion JPEG
  • Supports 16-bit color, HDR, and alpha channel transparency across all frames
  • Shares frame data blocks, meaning the base image and animation data are heavily optimized for space
Limitations
  • Zero support in web browsers outside the Apple ecosystem (Chrome, Firefox, Edge do not support it)
  • Heavily encumbered by HEVC patent pools, hindering open-source adoption
  • Complex container structure makes parsing and decoding difficult without specialized libraries
Kodak-KDC

Kodak-KDC Strengths

  • Preserves original raw sensor data, allowing modern demosaicing software to extract significantly more detail and dynamic range than the camera's built-in JPEG engine could at the time
  • Utilizes the standard TIFF container structure, ensuring broad compatibility with open-source decoding libraries (like LibRaw)
Limitations
  • Completely obsolete proprietary format tied to a defunct line of consumer digital cameras
  • Subject to widespread misidentification by automated MIME detection libraries due to structural similarities with standard TIFFs
  • Cannot be natively viewed in web browsers or standard operating system image viewers without specialized decoders

When to choose which format

HEIC-Sequence
Use HEIC-Sequence when…
  • Apple Live Photos
  • Burst Photography
  • High-Quality Animations
  • Cinemagraphs
Kodak-KDC
Use Kodak-KDC when…
  • Vintage Digital Photography Archival
  • Kodak DC and EasyShare P-Series Raw Post-Processing
  • Historical Imaging Research

More comparisons

HEIC-Sequence vs ACES → Kodak-KDC vs ACES → HEIC-Sequence vs APNG → Kodak-KDC vs APNG → HEIC-Sequence vs AVCI → Kodak-KDC vs AVCI → HEIC-Sequence vs AVCS → Kodak-KDC vs AVCS → HEIC-Sequence vs AVIF → Kodak-KDC vs AVIF → All comparisons →
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