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Image MIME Reference
Compressed-XCF

Compressed GIMP XCF Image

image/x-compressed-xcf
VS

JPEG 2000 Core Image File

image/jp2
JPEG-2000

A complete technical comparison of Compressed GIMP XCF Image and JPEG 2000 Core Image File — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

JPEG-2000 wins on browser support

Feature Support

Feature Compressed-XCF JPEG-2000
Transparency (Alpha) Yes Yes
Animation Support Yes ✕ No
Progressive Loading ✕ No Yes
HDR Support Yes Yes
EXIF Metadata Yes Yes
ICC Color Profile Yes Yes
Compressed GIMP XCF Image
image/x-compressed-xcf
Extension
.xcf.gz.xcf.bz2.xcfgz.xcfbz2
Container Gzip or Bzip2 Archive
Compression Gzip (Deflate) / Bzip2
Algorithm
DeflateBWT (Burrows-Wheeler)
Color Depth 8-bit (Per Channel), 16-bit (Integer/Floating Point), 32-bit (Integer/Floating Point)
Developed by The GIMP Team
Released 1995
Magic Bytes
1F 8B 08 (gzip) or 42 5A 68 (bzip2)
Full Compressed-XCF reference →
JPEG 2000 Core Image File
image/jp2
Extension
.jp2.j2k.jpf.jpx.jpm
Container JP2 (ISO/IEC 15444-1)
Compression Lossy / Lossless
Algorithm
Discrete Wavelet Transform (DWT)
Color Depth 8-bit, 16-bit, 32-bit, 38-bit
Developed by Joint Photographic Experts Group
Released 2000
Magic Bytes
00 00 00 0C 6A 50 20 20 0D 0A 87 0A
Full JPEG-2000 reference →

Browser Support Comparison

Browser Compressed-XCF JPEG-2000
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕
✓ 5+
Edge Edge
✕ ✕
IE IE (Legacy)
✕ ✕
Compressed-XCF

Compressed-XCF Strengths

  • Drastically reduces the massive file sizes of standard XCF project files, saving significant disk space
  • Preserves 100% of the non-destructive editing data (layers, masks, paths, guides) from the GIMP workspace
  • Uses standard, universally supported compression algorithms (gzip/bzip2) meaning the archive can be rescued or extracted by standard OS tools if GIMP is unavailable
Limitations
  • Increases file load and save times due to the CPU overhead required to compress and decompress the massive pixel arrays
  • Impossible for automated tools to parse metadata or dimensions without first unarchiving the payload into memory
  • File extension combinations (.xcf.gz) can confuse basic MIME sniffers which stop reading at the .gz extension
JPEG-2000

JPEG-2000 Strengths

  • Superior compression efficiency over baseline JPEG without introducing blocking artifacts
  • True mathematically lossless compression available in the same format
  • Extremely scalable: a single file can be decoded at various resolutions (thumbnails to full size) without loading the entire file
Limitations
  • Very poor native web browser support prevents it from being a web standard
  • High computational complexity makes encoding and decoding significantly slower than JPEG
  • Early patent concerns and complex licensing hindered its initial adoption rate

When to choose which format

Compressed-XCF
Use Compressed-XCF when…
  • GIMP Multi-layer Project Archival
  • Saving disk space for complex raster edits
  • Open-source graphic design workflows
JPEG-2000
Use JPEG-2000 when…
  • Digital Cinema (DCP)
  • Medical Imaging (DICOM)
  • Geospatial Data
  • Archival Preservation

More comparisons

Compressed-XCF vs ACES → JPEG-2000 vs ACES → Compressed-XCF vs APNG → JPEG-2000 vs APNG → Compressed-XCF vs AVCI → JPEG-2000 vs AVCI → Compressed-XCF vs AVCS → JPEG-2000 vs AVCS → Compressed-XCF vs AVIF → JPEG-2000 vs AVIF → All comparisons →
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