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Image MIME Reference
JPEG-XS-Sequence

JPEG XS Image Sequence (HEIF Container)

image/jxss
VS

Microsoft Image Extension

image/vnd.mix
MIX

A complete technical comparison of JPEG XS Image Sequence (HEIF Container) and Microsoft Image Extension — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

Equal browser support

Feature Support

Feature JPEG-XS-Sequence MIX
Transparency (Alpha) Yes Yes
Animation Support Yes ✕ No
Progressive Loading ✕ No ✕ No
HDR Support Yes ✕ No
EXIF Metadata Yes ✕ No
ICC Color Profile Yes Yes
JPEG XS Image Sequence (HEIF Container)
image/jxss
Extension
.jxss.jxs
Container HEIF / ISOBMFF (ISO/IEC 23008-12)
Compression Lossy (Visually Lossless) / Mathematically Lossless
Algorithm
JPEG XS (ISO/IEC 21122-1)
Color Depth 8-bit, 10-bit, 12-bit, 14-bit, 16-bit
Developed by Joint Photographic Experts Group (JPEG)
Released 2019
Magic Bytes
XX XX XX XX 66 74 79 70 6A 78 73 73
Full JPEG-XS-Sequence reference →
Microsoft Image Extension
image/vnd.mix
Extension
.mix
Container Microsoft OLE Structured Storage (COM)
Compression Proprietary (Internal JPEG/RLE)
Algorithm
JPEGDeflateProprietary
Color Depth 8-bit, 24-bit, 32-bit (RGBA)
Developed by Microsoft Corporation
Released 1996
Magic Bytes
D0 CF 11 E0 A1 B1 1A E1
Full MIX reference →

Browser Support Comparison

Browser JPEG-XS-Sequence MIX
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕ ✕
Edge Edge
✕ ✕
IE IE (Legacy)
✕ ✕
JPEG-XS-Sequence

JPEG-XS-Sequence Strengths

  • Provides sub-millisecond encoding and decoding latency across a video sequence while retaining visually lossless quality
  • Leverages the robust ISOBMFF track structures for accurate frame timing, audio synchronization, and metadata handling
  • Optimized for professional video production and IP broadcasting workflows
Limitations
  • Zero web browser compatibility, limiting its use entirely to professional and industrial hardware workflows
  • Compression ratios are significantly lower than consumer video codecs like HEVC or AV1
  • Extremely niche format that requires highly specialized broadcast hardware or custom software libraries to process
MIX

MIX Strengths

  • Allowed early consumer software to non-destructively edit complex compositions involving photos, text, and vector clipart
  • Shared an architecture with other Microsoft Office products, enabling deep integration (OLE embedding) into Word and PowerPoint at the time
Limitations
  • Completely proprietary and undocumented, leading to a massive loss of historical data for users who archived their family photos in this project format
  • Requires traversing a complex OLE filesystem just to extract the flattened raster image
  • No support in modern image editors like Photoshop, GIMP, or web browsers

When to choose which format

JPEG-XS-Sequence
Use JPEG-XS-Sequence when…
  • Live Broadcast Video Snippets
  • Medical Imaging Sequences
  • HDR Burst Photography Archiving
  • Automotive & Drone Video Storage
MIX
Use MIX when…
  • Historical Microsoft Picture It! Projects
  • Microsoft PhotoDraw 2000 Graphics
  • Early 2000s Consumer Digital Scrapbooking

More comparisons

JPEG-XS-Sequence vs ACES → MIX vs ACES → JPEG-XS-Sequence vs APNG → MIX vs APNG → JPEG-XS-Sequence vs AVCI → MIX vs AVCI → JPEG-XS-Sequence vs AVCS → MIX vs AVCS → JPEG-XS-Sequence vs AVIF → MIX vs AVIF → All comparisons →
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