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Image MIME Reference
AVCI

AVC Image (HEIF Container)

image/avci
VS

Multi-resolution Seamless Image Database

image/x-mrsid-image
MrSID

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

Equal browser support

Feature Support

Feature AVCI MrSID
Transparency (Alpha) Yes Yes
Animation Support ✕ No ✕ No
Progressive Loading ✕ No Yes
HDR Support Yes ✕ No
EXIF Metadata Yes Yes
ICC Color Profile Yes Yes
AVC Image (HEIF Container)
image/avci
Extension
.avci.hif
Container HEIF / ISOBMFF (ISO/IEC 14496-12)
Compression Lossy / Lossless
Algorithm
AVC (Advanced Video Coding / H.264)
Color Depth 8-bit, 10-bit, 12-bit
Developed by Moving Picture Experts Group (MPEG) / ISO/IEC JTC 1
Released 2015
Magic Bytes
XX XX XX XX 66 74 79 70 61 76 63 69
Full AVCI reference →
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 →

Browser Support Comparison

Browser AVCI MrSID
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕ ✕
Edge Edge
✕ ✕
IE IE (Legacy)
✕ ✕
AVCI

AVCI Strengths

  • Shares the robust, flexible HEIF container architecture that allows for rich metadata, HDR, and depth maps.
  • Backed by the highly ubiquitous AVC (H.264) codec, which is widely supported in hardware decoding.
  • Supports rectangular cropping and rotation metadata without needing to re-encode the pixel data.
Limitations
  • No native support within web browsers for HTML rendering.
  • Inferior compression efficiency when compared to newer container formats like HEIC (HEVC) or AVIF (AV1).
  • Easily confused with HEIC and AVIF, which use the same base ISOBMFF container.
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

When to choose which format

AVCI
Use AVCI when…
  • Digital Photography
  • Camera Capture
  • Archival Storage
MrSID
Use MrSID when…
  • Geographic Information Systems (GIS)
  • Satellite Imagery Archival
  • Aerial Orthophotography Mosaics

More comparisons

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