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Image MIME Reference
Kodak-KDC

Kodak KDC Raw Image

image/x-kodak-kdc
VS

Silicon Graphics Image

image/x-rgb
SGI-RGB

A complete technical comparison of Kodak KDC Raw Image and Silicon Graphics Image — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

Equal browser support

Feature Support

Feature Kodak-KDC SGI-RGB
Transparency (Alpha) ✕ No Yes
Animation Support ✕ No ✕ No
Progressive Loading ✕ No ✕ No
HDR Support Yes ✕ No
EXIF Metadata Yes ✕ No
ICC Color Profile Yes ✕ No
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 →
Silicon Graphics Image
image/x-rgb
Extension
.rgb.sgi.rgba.bw.int.inta
Container SGI Image Header (512 bytes)
Compression Uncompressed / Run-Length Encoding (RLE)
Algorithm
NoneScanline RLE
Color Depth 8-bit (Per Channel), 16-bit (Per Channel)
Developed by Silicon Graphics, Inc. (Paul Haeberli)
Released 1988
Magic Bytes
01 DA
Full SGI-RGB reference →

Browser Support Comparison

Browser Kodak-KDC SGI-RGB
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕ ✕
Edge Edge
✕ ✕
IE IE (Legacy)
✕ ✕
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
SGI-RGB

SGI-RGB Strengths

  • Supports 16-bit precision per channel and an embedded alpha channel, making it ideal for the demanding compositing workflows of 1990s cinema VFX
  • The scanline-based RLE compression was exceptionally fast to decode on classic MIPS-based SGI workstations
  • Features a straightforward 512-byte header, making it relatively easy to parse and write custom decoders in C or Python
Limitations
  • Completely obsolete and unsupported in modern web environments
  • Replaced entirely by TIFF, OpenEXR, and PNG in modern visual effects and 3D rendering pipelines
  • Lacks support for modern color management via ICC profiles or advanced EXIF metadata

When to choose which format

Kodak-KDC
Use Kodak-KDC when…
  • Vintage Digital Photography Archival
  • Kodak DC and EasyShare P-Series Raw Post-Processing
  • Historical Imaging Research
SGI-RGB
Use SGI-RGB when…
  • Legacy 3D Animation and VFX Textures
  • Silicon Graphics IRIX Workstation Archival
  • 1990s Medical Imaging

More comparisons

Kodak-KDC vs ACES → SGI-RGB vs ACES → Kodak-KDC vs APNG → SGI-RGB vs APNG → Kodak-KDC vs AVCI → SGI-RGB vs AVCI → Kodak-KDC vs AVCS → SGI-RGB vs AVCS → Kodak-KDC vs AVIF → SGI-RGB vs AVIF → All comparisons →
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