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Image MIME Reference
JPEG-XR

JPEG XR (HD Photo)

image/vnd.ms-photo
VS

GIMP Image Format

image/x-xcf
XCF

A complete technical comparison of JPEG XR (HD Photo) and GIMP Image Format — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

Equal browser support

Feature Support

Feature JPEG-XR XCF
Transparency (Alpha) Yes Yes
Animation Support ✕ No Yes
Progressive Loading Yes ✕ No
HDR Support Yes Yes
EXIF Metadata Yes Yes
ICC Color Profile Yes Yes
JPEG XR (HD Photo)
image/vnd.ms-photo
Extension
.jxr.wdp.hdp
Container TIFF-like Image File Directory (IFD)
Compression Lossy (Lapped Bi-orthogonal Transform) / Lossless
Algorithm
Lapped Bi-orthogonal Transform (LBT)
Color Depth 8-bit (Grayscale, RGB, CMYK), 16-bit, 32-bit Floating Point (HDR)
Developed by Microsoft Corporation (later Joint Photographic Experts Group)
Released 2006
Magic Bytes
49 49 BC 01
Full JPEG-XR reference →
GIMP Image Format
image/x-xcf
Extension
.xcf
Container GIMP Hierarchical Chunk Container
Compression None / RLE (Run-Length Encoding) / Zlib / Deflate (In newer GIMP versions)
Algorithm
NoneRLEZlib
Color Depth 8-bit per channel, 16-bit per channel, 32-bit floating point
Developed by Spencer Kimball, Peter Mattis, and the GIMP Development Team
Released 1995
Magic Bytes
67 69 6D 70 20 78 63 66
Full XCF reference →

Browser Support Comparison

Browser JPEG-XR XCF
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕ ✕
Edge Edge
✕ ✕
IE IE (Legacy)
✓
 ✕
JPEG-XR

JPEG-XR Strengths

  • Excellent support for 16-bit and 32-bit floating-point HDR images without massive file size bloat
  • Native support for alpha transparency, which standard JPEG fundamentally lacks
  • Computational complexity for decoding/encoding is relatively low, making it hardware-friendly
Limitations
  • Suffered a complete failure of adoption in the web browser market outside of Microsoft's ecosystem
  • Fully superseded by modern, open formats like WebP, AVIF, and JPEG XL which offer better compression and universal browser support
  • Multiple file extensions (.wdp, .hdp, .jxr) and MIME types cause confusion and parsing fragmentation
XCF

XCF Strengths

  • Preserves all non-destructive editing elements, layer hierarchies, masks, and alpha channels across GIMP sessions
  • Open and thoroughly documented specification within the open-source community, allowing third-party tools like Krita and ImageMagick to read project files
  • Reliable magic byte header prevents misidentification
Limitations
  • Massive file sizes because raw, unflattened layer bitmaps and masks are stored directly within the project archive
  • Completely proprietary to the GIMP ecosystem for deep editing; cannot be natively rendered or parsed by web browsers
  • Third-party software supporting XCF may occasionally struggle to render complex text layer adjustments or advanced layer blend modes identically to GIMP

When to choose which format

JPEG-XR
Use JPEG-XR when…
  • Legacy Windows Desktop Backgrounds
  • XPS (XML Paper Specification) Documents
  • Early High Dynamic Range (HDR) Photography
  • DirectX Textures
XCF
Use XCF when…
  • GIMP Native Project Archival
  • Layered Photo Editing and Graphic Design
  • Intermediary Asset Preparation for Export

More comparisons

JPEG-XR vs ACES → XCF vs ACES → JPEG-XR vs APNG → XCF vs APNG → JPEG-XR vs AVCI → XCF vs AVCI → JPEG-XR vs AVCS → XCF vs AVCS → JPEG-XR vs AVIF → XCF vs AVIF → All comparisons →
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