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Image MIME Reference
HEIF-Sequence

High Efficiency Image File Format Sequence

image/heif-sequence
VS

JPEG XS Codestream

image/jxsc
JPEG-XS-Codestream

A complete technical comparison of High Efficiency Image File Format Sequence and JPEG XS Codestream — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

Equal browser support

Feature Support

Feature HEIF-Sequence JPEG-XS-Codestream
Transparency (Alpha) Yes Yes
Animation Support Yes ✕ No
Progressive Loading ✕ No ✕ No
HDR Support Yes Yes
EXIF Metadata Yes ✕ No
ICC Color Profile Yes ✕ No
High Efficiency Image File Format Sequence
image/heif-sequence
Extension
.heifs.heif.hif
Container HEIF / ISOBMFF (ISO/IEC 14496-12)
Compression Lossy / Lossless
Algorithm
Codec Agnostic (HEVC, AVC, JPEG, AV1)
Color Depth 8-bit, 10-bit, 12-bit, 16-bit
Developed by Moving Picture Experts Group (MPEG)
Released 2015
Magic Bytes
XX XX XX XX 66 74 79 70 6D 73 66 31
Full HEIF-Sequence reference →
JPEG XS Codestream
image/jxsc
Extension
.jxsc.jxs
Container None (Raw Codestream)
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) / intoPIX
Released 2019
Magic Bytes
FF 10
Full JPEG-XS-Codestream reference →

Browser Support Comparison

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

HEIF-Sequence Strengths

  • Codec-agnostic container allows for extreme flexibility when storing multi-frame photographic data
  • Maintains the space-saving benefits of ISOBMFF shared frame data blocks
  • Excellent for archiving computational photography workloads like exposure brackets or focal stacks
Limitations
  • Codec ambiguity means a decoder might be able to parse the container but fail to decode the underlying pixels
  • Zero native web browser support
  • Complex container structure requires specialized parsing libraries to extract individual frames
JPEG-XS-Codestream

JPEG-XS-Codestream Strengths

  • Eliminates container overhead, maximizing parsing speed and minimizing latency to fractions of a millisecond
  • Highly optimized for direct hardware implementation in FPGAs and ASICs
  • Perfect for continuous data streaming over IP networks without needing to establish file headers
Limitations
  • Lacks standard container metadata (EXIF, XMP, ICC profiles), meaning color space and orientation data must be handled externally or out-of-band
  • Zero support in web browsers or standard consumer operating systems
  • Often requires specialized broadcast hardware or custom software libraries to decode

When to choose which format

HEIF-Sequence
Use HEIF-Sequence when…
  • Burst Photography
  • Focal Stacking
  • Exposure Bracketing
  • Time-Lapse Data
JPEG-XS-Codestream
Use JPEG-XS-Codestream when…
  • Hardware Decoding Pipelines (FPGA/ASIC)
  • Live Broadcast Infrastructure
  • Video over IP Transport
  • Embedded Camera Systems

More comparisons

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