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Image MIME Reference
HTJ2K-(JPH)

High-Throughput JPEG 2000 Image

image/jph
VS

JPEG XS Codestream

image/jxsc
JPEG-XS-Codestream

A complete technical comparison of High-Throughput JPEG 2000 Image and JPEG XS Codestream — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

Equal browser support

Feature Support

Feature HTJ2K-(JPH) JPEG-XS-Codestream
Transparency (Alpha) Yes Yes
Animation Support ✕ No ✕ No
Progressive Loading Yes ✕ No
HDR Support Yes Yes
EXIF Metadata Yes ✕ No
ICC Color Profile Yes ✕ No
High-Throughput JPEG 2000 Image
image/jph
Extension
.jph
Container JPH (ISO/IEC 15444-15)
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
00 00 00 0C 6A 50 20 20 0D 0A 87 0A ... 66 74 79 70 6A 70 68 20
Full HTJ2K-(JPH) reference →
JPEG XS Codestream
image/jxsc
Extension
.jxsc.jxs
Container None (Raw Codestream)
Compression Lossy (Visually Lossless) / Mathematically Lossless
Algorithm
JPEG XS (ISO/IEC 21122-1)
Color Depth 8-bit, 10-bit, 12-bit, 14-bit, 16-bit
Developed by Joint Photographic Experts Group (JPEG) / intoPIX
Released 2019
Magic Bytes
FF 10
Full JPEG-XS-Codestream reference →

Browser Support Comparison

Browser HTJ2K-(JPH) JPEG-XS-Codestream
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕ ✕
Edge Edge
✕ ✕
IE IE (Legacy)
✕ ✕
HTJ2K-(JPH)

HTJ2K-(JPH) Strengths

  • Delivers orders of magnitude faster encoding and decoding than standard JPEG 2000 by utilizing a new, parallelizable block coder
  • Supports mathematically lossless and lossy compression within the same codestream architecture
  • Allows for resolution scalability, progressive decoding, and region-of-interest extraction without needing to decode the entire image
Limitations
  • Zero native web browser support, requiring specialized libraries, API conversions, or WebAssembly (like OpenJPH.js) for web deployment
  • Lack of broad consumer awareness, keeping it confined to professional, medical, and scientific workflows
  • Requires more advanced software ecosystems to decode than ubiquitous formats like JPEG or WebP
JPEG-XS-Codestream

JPEG-XS-Codestream Strengths

  • Eliminates container overhead, maximizing parsing speed and minimizing latency to fractions of a millisecond
  • Highly optimized for direct hardware implementation in FPGAs and ASICs
  • Perfect for continuous data streaming over IP networks without needing to establish file headers
Limitations
  • Lacks standard container metadata (EXIF, XMP, ICC profiles), meaning color space and orientation data must be handled externally or out-of-band
  • Zero support in web browsers or standard consumer operating systems
  • Often requires specialized broadcast hardware or custom software libraries to decode

When to choose which format

HTJ2K-(JPH)
Use HTJ2K-(JPH) when…
  • Medical Imaging (DICOM)
  • Geospatial Data
  • Digital Cinema
  • Professional Archiving
JPEG-XS-Codestream
Use JPEG-XS-Codestream when…
  • Hardware Decoding Pipelines (FPGA/ASIC)
  • Live Broadcast Infrastructure
  • Video over IP Transport
  • Embedded Camera Systems

More comparisons

HTJ2K-(JPH) vs ACES → JPEG-XS-Codestream vs ACES → HTJ2K-(JPH) vs APNG → JPEG-XS-Codestream vs APNG → HTJ2K-(JPH) vs AVCI → JPEG-XS-Codestream vs AVCI → HTJ2K-(JPH) vs AVCS → JPEG-XS-Codestream vs AVCS → HTJ2K-(JPH) vs AVIF → JPEG-XS-Codestream vs AVIF → All comparisons →
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