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Image MIME Reference
SoftSeal-GIF

SealedMedia SoftSeal GIF

image/vnd.sealedmedia.softseal.gif
VS

Truevision TGA (Legacy MIME Alias)

image/x-tga
TGA

A complete technical comparison of SealedMedia SoftSeal GIF and Truevision TGA (Legacy MIME Alias) — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

Equal browser support

Feature Support

Feature SoftSeal-GIF TGA
Transparency (Alpha) ✕ No Yes
Animation Support ✕ No ✕ No
Progressive Loading ✕ No ✕ No
HDR Support ✕ No ✕ No
EXIF Metadata ✕ No ✕ No
ICC Color Profile ✕ No ✕ No
SealedMedia SoftSeal GIF
image/vnd.sealedmedia.softseal.gif
Extension
.sgif.sealed-gif
Container SealedMedia SoftSeal Wrapper
Compression Encrypted Payload (LZW)
Algorithm
AES EncryptionLZW (Internal GIF payload)
Color Depth Encrypted Payload (Historically up to 8-bit Indexed)
Developed by SealedMedia (Acquired by Oracle Corporation)
Released Late 1990s
Magic Bytes
Unknown (Proprietary SealedMedia Container)
Full SoftSeal-GIF reference →
Truevision TGA (Legacy MIME Alias)
image/x-tga
Extension
.tga.icb.vda.vst
Container Truevision TGA Footer/Header
Compression Uncompressed / Run-Length Encoding (RLE)
Algorithm
NoneRLE
Color Depth 8-bit (Grayscale or Indexed), 16-bit (High Color), 24-bit (True Color), 32-bit (True Color with Alpha Channel)
Developed by Truevision Inc.
Released 1984
Magic Bytes
54 52 55 45 56 49 53 49 4F 4E 2D 58 46 49 4C 45 2E 00 (At the end of the file)
Full TGA reference →

Browser Support Comparison

Browser SoftSeal-GIF TGA
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕ ✕
Edge Edge
✕ ✕
IE IE (Legacy)
✕ ✕
SoftSeal-GIF

SoftSeal-GIF Strengths

  • Provided robust, persistent security that traveled with the file, ensuring images could not be leaked even if sent outside the corporate firewall
  • Enabled dynamic revocation, meaning administrators could instantly kill access to a file globally
Limitations
  • Completely proprietary and dependent on an active authentication server; if the DRM server dies, the image is permanently locked
  • Zero support in modern operating systems, web browsers, or standard image editing suites without heavy enterprise client installations
  • Often caused massive friction for legitimate end-users trying to view documents
TGA

TGA Strengths

  • Incredibly simple byte layout allows developers to write custom loaders and exporters in a few dozen lines of code, bypassing the need for heavy external libraries
  • Native support for 8-bit alpha channels ensures flawless transparency masking for real-time 3D rendering
  • Fast, predictable RLE decoding requires almost no CPU overhead compared to DEFLATE (PNG) or DCT (JPEG)
Limitations
  • RLE compression is relatively weak by modern standards, resulting in large file sizes
  • Lacks a standard magic byte header at the beginning of the file, making file-sniffing unreliable for older v1.0 files
  • Zero support in web browsers; must be converted to PNG or WebP for web delivery

When to choose which format

SoftSeal-GIF
Use SoftSeal-GIF when…
  • Enterprise Information Rights Management (IRM)
  • Secure Distribution of Corporate Assets
  • Revocable Medical, Legal, or Financial Imaging
TGA
Use TGA when…
  • Video Game 3D Textures and Materials
  • 3D Rendering and Animation Sequences
  • Legacy Video Production Workflows

More comparisons

SoftSeal-GIF vs ACES → TGA vs ACES → SoftSeal-GIF vs APNG → TGA vs APNG → SoftSeal-GIF vs AVCI → TGA vs AVCI → SoftSeal-GIF vs AVCS → TGA vs AVCS → SoftSeal-GIF vs AVIF → TGA vs AVIF → All comparisons →
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