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Image MIME Reference
Compressed-XCF

Compressed GIMP XCF Image

image/x-compressed-xcf
VS

SealedMedia SoftSeal GIF

image/vnd.sealedmedia.softseal.gif
SoftSeal-GIF

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

Equal browser support

Feature Support

Feature Compressed-XCF SoftSeal-GIF
Transparency (Alpha) Yes ✕ No
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 →
SealedMedia SoftSeal GIF
image/vnd.sealedmedia.softseal.gif
Extension
.sgif.sealed-gif
Container SealedMedia SoftSeal Wrapper
Compression Encrypted Payload (LZW)
Algorithm
AES EncryptionLZW (Internal GIF payload)
Color Depth Encrypted Payload (Historically up to 8-bit Indexed)
Developed by SealedMedia (Acquired by Oracle Corporation)
Released Late 1990s
Magic Bytes
Unknown (Proprietary SealedMedia Container)
Full SoftSeal-GIF reference →

Browser Support Comparison

Browser Compressed-XCF SoftSeal-GIF
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
SoftSeal-GIF

SoftSeal-GIF Strengths

  • Provided robust, persistent security that traveled with the file, ensuring images could not be leaked even if sent outside the corporate firewall
  • Enabled dynamic revocation, meaning administrators could instantly kill access to a file globally
Limitations
  • Completely proprietary and dependent on an active authentication server; if the DRM server dies, the image is permanently locked
  • Zero support in modern operating systems, web browsers, or standard image editing suites without heavy enterprise client installations
  • Often caused massive friction for legitimate end-users trying to view documents

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
SoftSeal-GIF
Use SoftSeal-GIF when…
  • Enterprise Information Rights Management (IRM)
  • Secure Distribution of Corporate Assets
  • Revocable Medical, Legal, or Financial Imaging

More comparisons

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