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Image MIME Reference
HEIF-Sequence

High Efficiency Image File Format Sequence

image/heif-sequence
VS

SealedMedia SoftSeal JPEG

image/vnd.sealedmedia.softseal.jpg
SoftSeal-JPEG

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

Equal browser support

Feature Support

Feature HEIF-Sequence SoftSeal-JPEG
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
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 →
SealedMedia SoftSeal JPEG
image/vnd.sealedmedia.softseal.jpg
Extension
.sjpg.sealed-jpg.sealed-jpeg
Container SealedMedia SoftSeal Wrapper
Compression Encrypted Payload (DCT)
Algorithm
AES EncryptionDiscrete Cosine Transform (Internal JPEG payload)
Color Depth Encrypted Payload (Historically 24-bit RGB)
Developed by SealedMedia (Acquired by Oracle Corporation)
Released Late 1990s
Magic Bytes
Unknown (Proprietary SealedMedia Container)
Full SoftSeal-JPEG reference →

Browser Support Comparison

Browser HEIF-Sequence SoftSeal-JPEG
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
SoftSeal-JPEG

SoftSeal-JPEG Strengths

  • Offered persistent document security; if a sensitive photo was emailed outside the company, it remained encrypted and unviewable without server authentication
  • Administrators possessed the ability to remotely revoke viewing rights to a specific image globally at any time
Limitations
  • Completely proprietary and relies on a central authentication server; if the server goes offline or the product is deprecated, the image is permanently inaccessible
  • Zero support in modern operating systems, web browsers, or standard image editing suites without heavy enterprise client installations
  • Oracle effectively discontinued the IRM product line, stranding many legacy sealed documents

When to choose which format

HEIF-Sequence
Use HEIF-Sequence when…
  • Burst Photography
  • Focal Stacking
  • Exposure Bracketing
  • Time-Lapse Data
SoftSeal-JPEG
Use SoftSeal-JPEG when…
  • Enterprise Information Rights Management (IRM)
  • Secure Distribution of Sensitive Photography
  • Revocable Corporate Document Access

More comparisons

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