Image MIME Reference
DECE-Graphic
Digital Entertainment Content Ecosystem (DECE) Graphic
image/vnd.dece.graphic
VS
High-Throughput JPEG 2000 Codestream
image/jphc
HTJ2K-Codestream
A complete technical comparison of Digital Entertainment Content Ecosystem (DECE) Graphic and High-Throughput JPEG 2000 Codestream — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.
Equal browser support
Feature Support
| Feature | DECE-Graphic | HTJ2K-Codestream |
|---|---|---|
| Transparency (Alpha) | Yes | Yes |
| Animation Support | ✕ No | ✕ No |
| Progressive Loading | ✕ No | Yes |
| HDR Support | ✕ No | Yes |
| EXIF Metadata | ✕ No | ✕ No |
| ICC Color Profile | ✕ No | ✕ No |
Digital Entertainment Content Ecosystem (DECE) Graphic
image/vnd.dece.graphic
Extension
.jpg.png.uvi
Container
Standard JPEG/PNG within DECE CFF structures
Compression
Lossy (JPEG) / Lossless (PNG)
Algorithm
DCT (JPEG)DEFLATE (PNG)
Color Depth
8-bit (RGB), 24-bit (RGB)
Developed by
Digital Entertainment Content Ecosystem (DECE) LLC
Released
2011
Magic Bytes
FF D8 FF (If JPEG) / 89 50 4E 47 (If PNG)
High-Throughput JPEG 2000 Codestream
image/jphc
Extension
.jhc
Container
None (Raw Codestream)
Compression
Lossy / Lossless
Algorithm
High-Throughput JPEG 2000 (HTJ2K)
Color Depth
8-bit, 16-bit, 32-bit, 38-bit
Developed by
Joint Photographic Experts Group (JPEG)
Released
2019
Magic Bytes
FF 4F FF 51
Browser Support Comparison
| Browser | DECE-Graphic | HTJ2K-Codestream |
|---|---|---|
Chrome
|
✕ | ✕ |
Firefox
|
✕ | ✕ |
Safari
|
✕ | ✕ |
Edge
|
✕ | ✕ |
IE (Legacy)
|
✕ | ✕ |
DECE-Graphic
DECE-Graphic Strengths
- Allowed the UltraViolet DRM ecosystem to easily distinguish structural UI/cover graphic assets from actual encrypted video tracks in a Common File Format container
Limitations
- Completely obsolete since the 2019 shutdown of UltraViolet
- Unnecessary abstraction, as the underlying files were just standard JPEGs or PNGs
- Causes modern strict MIME-type validators to fail if they rely on the Content-Type header
HTJ2K-Codestream
HTJ2K-Codestream Strengths
- Extremely fast encoding and decoding capabilities due to the parallelizable block coder
- Minimal file overhead since it lacks container headers and metadata
- Ideal for streaming applications or embedded systems where parsing a full container is unnecessary
Limitations
- Lacks standard metadata support (like EXIF, XMP, or ICC color profiles) since there is no container structure
- Zero native web browser compatibility
- Difficult to distinguish from standard JPEG 2000 codestreams without deeply parsing the internal marker segments
When to choose which format
DECE-Graphic
Use DECE-Graphic when…
- UltraViolet Movie Cover Art
- Common File Format (CFF) Asset Manifests
- Legacy DRM Ecosystems
HTJ2K-Codestream
Use HTJ2K-Codestream when…
- Medical Imaging Pipelines
- Geospatial Data Streaming
- Digital Cinema
- Embedded Systems