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Image MIME Reference
MrSID

Multi-resolution Seamless Image Database

image/x-mrsid-image
VS

GIMP Image Format

image/x-xcf
XCF

A complete technical comparison of Multi-resolution Seamless Image Database and GIMP Image Format — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

Equal browser support

Feature Support

Feature MrSID XCF
Transparency (Alpha) Yes Yes
Animation Support ✕ No Yes
Progressive Loading Yes ✕ No
HDR Support ✕ No Yes
EXIF Metadata Yes Yes
ICC Color Profile Yes Yes
Multi-resolution Seamless Image Database
image/x-mrsid-image
Extension
.sid
Container Proprietary MrSID Container
Compression Proprietary Wavelet (Lossy) / Proprietary Wavelet (Lossless)
Algorithm
Discrete Wavelet Transform (DWT)
Color Depth 8-bit (Grayscale), 24-bit (RGB), Multi-spectral (Multiple bands)
Developed by Los Alamos National Laboratory / LizardTech (Extensis)
Released 1992
Magic Bytes
6D 73 69 64
Full MrSID 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 MrSID XCF
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕ ✕
Edge Edge
✕ ✕
IE IE (Legacy)
✕ ✕
MrSID

MrSID Strengths

  • Incredible compression ratios enable multi-gigabyte geographical datasets to be stored on standard hard drives or transmitted easily
  • Multi-resolution architecture means panning and zooming across a massive map is completely fluid, as the system decodes only the visible quadrant at the required zoom level
  • Supports multi-spectral bands critical for remote sensing and agricultural GIS analysis
Limitations
  • Deeply proprietary; creating or decoding MrSID files typically requires expensive commercial software or the proprietary Extensis DSDK
  • Open-source geospatial libraries like GDAL require compiling against the proprietary SDK to legally enable MrSID support, causing licensing headaches for Linux server deployments
  • Not natively viewable on the web without specialized geospatial map servers (like GeoServer or MapServer) tiling the image into PNGs or JPEGs on the fly
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

MrSID
Use MrSID when…
  • Geographic Information Systems (GIS)
  • Satellite Imagery Archival
  • Aerial Orthophotography Mosaics
XCF
Use XCF when…
  • GIMP Native Project Archival
  • Layered Photo Editing and Graphic Design
  • Intermediary Asset Preparation for Export

More comparisons

MrSID vs ACES → XCF vs ACES → MrSID vs APNG → XCF vs APNG → MrSID vs AVCI → XCF vs AVCI → MrSID vs AVCS → XCF vs AVCS → MrSID vs AVIF → XCF vs AVIF → All comparisons →
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