Free webp to jpg
EN
Image MIME Reference
HTJ2K-Codestream

High-Throughput JPEG 2000 Codestream

image/jphc
VS

Panasonic RAW Image

image/x-panasonic-raw
Panasonic-RAW-(RW2)

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

Equal browser support

Feature Support

Feature HTJ2K-Codestream Panasonic-RAW-(RW2)
Transparency (Alpha) Yes ✕ No
Animation Support ✕ No ✕ No
Progressive Loading Yes ✕ No
HDR Support Yes Yes
EXIF Metadata ✕ No Yes
ICC Color Profile ✕ No Yes
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
Full HTJ2K-Codestream reference →
Panasonic RAW Image
image/x-panasonic-raw
Extension
.raw.rw2
Container TIFF-based (Proprietary)
Compression Uncompressed / Panasonic Proprietary Lossless
Algorithm
NoneProprietary Lossless
Color Depth 12-bit (Per Channel), 14-bit (Per Channel), 16-bit (Per Channel - High-res mode)
Developed by Panasonic Corporation
Released 2004
Magic Bytes
Older RAW: 49 49 2A 00 | Newer RW2: 49 49 55 00
Full Panasonic-RAW-(RW2) reference →

Browser Support Comparison

Browser HTJ2K-Codestream Panasonic-RAW-(RW2)
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕ ✕
Edge Edge
✕ ✕
IE IE (Legacy)
✕ ✕
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
Panasonic-RAW-(RW2)

Panasonic-RAW-(RW2) Strengths

  • Retains maximum sensor data, allowing significant recovery of highlights and shadows compared to in-camera JPEGs
  • Modern RW2 files embed proprietary lens correction profiles (distortion, vignetting, chromatic aberration) that raw converters can automatically apply
  • The unique 'IIU' signature on RW2 files makes programmatic identification extremely reliable compared to other TIFF-spoofing raw formats
Limitations
  • Proprietary format requires continuous updates to third-party processing engines whenever Panasonic releases a new Lumix camera
  • Produces very large file sizes, particularly when using Panasonic's High-Resolution multi-shot modes
  • Cannot be directly embedded into web pages or used in standard HTML/CSS contexts

When to choose which format

HTJ2K-Codestream
Use HTJ2K-Codestream when…
  • Medical Imaging Pipelines
  • Geospatial Data Streaming
  • Digital Cinema
  • Embedded Systems
Panasonic-RAW-(RW2)
Use Panasonic-RAW-(RW2) when…
  • Professional Digital Photography
  • Non-destructive Image Post-Processing
  • High Dynamic Range (HDR) Lumix Archival

More comparisons

HTJ2K-Codestream vs ACES → Panasonic-RAW-(RW2) vs ACES → HTJ2K-Codestream vs APNG → Panasonic-RAW-(RW2) vs APNG → HTJ2K-Codestream vs AVCI → Panasonic-RAW-(RW2) vs AVCI → HTJ2K-Codestream vs AVCS → Panasonic-RAW-(RW2) vs AVCS → HTJ2K-Codestream vs AVIF → Panasonic-RAW-(RW2) vs AVIF → All comparisons →
Share this comparison