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Image MIME Reference
Compressed-XCF

Compressed GIMP XCF Image

image/x-compressed-xcf
VS

QuickTime Image Format

image/x-quicktime
QTIF

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

Equal browser support

Feature Support

Feature Compressed-XCF QTIF
Transparency (Alpha) Yes Yes
Animation Support Yes ✕ No
Progressive Loading ✕ No ✕ No
HDR Support Yes ✕ No
EXIF Metadata Yes ✕ No
ICC Color Profile Yes ✕ No
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 →
QuickTime Image Format
image/x-quicktime
Extension
.qtif.qti.qif
Container QuickTime Atom Container
Compression Varies (JPEG, SMC, Apple Video, Cinepak, Uncompressed)
Algorithm
QuickTime Image Compression Manager (ICM) Codecs
Color Depth 1-bit to 32-bit (Varies depending on the enclosed codec)
Developed by Apple Computer, Inc.
Released 1991
Magic Bytes
Varies (Typically begins with a 32-bit size integer followed by 69 64 73 63 ('idsc'))
Full QTIF reference →

Browser Support Comparison

Browser Compressed-XCF QTIF
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕ ✕
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
QTIF

QTIF Strengths

  • Extremely flexible architecture allowing it to encapsulate virtually any image compression algorithm available on the host machine
  • Supported 32-bit images with alpha channels (transparency) long before PNG became an established standard
Limitations
  • Fundamentally tied to Apple's deprecated QuickTime architecture, rendering the files almost entirely unreadable on modern systems without specialized legacy software or FFmpeg
  • The 'wrapper' nature of the format means that even if a parser can read the QTIF container, it may fail to render the image if it lacks the specific proprietary codec (like Apple SMC) used to compress the pixel data
  • Zero native support in modern web browsers

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
QTIF
Use QTIF when…
  • Classic Mac OS Applications and Backgrounds
  • QuickTime VR Panorama Textures
  • 1990s CD-ROM Multimedia Assets

More comparisons

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