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Image MIME Reference
FACTI

BlockFact Image

image/vnd.blockfact.facti
VS

Truevision TGA (Legacy MIME Alias)

image/x-tga
TGA

A complete technical comparison of BlockFact Image 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 FACTI TGA
Transparency (Alpha) Yes Yes
Animation Support ✕ No ✕ No
Progressive Loading ✕ No ✕ No
HDR Support Yes ✕ No
EXIF Metadata Yes ✕ No
ICC Color Profile Yes ✕ No
BlockFact Image
image/vnd.blockfact.facti
Extension
.facti
Container BlockFact Authenticated Container
Compression Container (Inherits payload compression, e.g., JPEG/PNG)
Algorithm
None (Pass-through to embedded payload)
Color Depth Inherited from payload
Developed by BlockFact
Released 2025
Magic Bytes
Unknown (Proprietary Container)
Full FACTI 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 FACTI TGA
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕ ✕
Edge Edge
✕ ✕
IE IE (Legacy)
✕ ✕
FACTI

FACTI Strengths

  • Provides undeniable, mathematically verifiable proof of a photo's origin (time, location, and device) via the StarkNet blockchain [1.3.1]
  • Privacy-first design utilizes zero-knowledge proofs (Groth16), meaning the actual image is never uploaded to a central server or blockchain
  • Invisible watermarking ensures that even if the image is screenshotted or cropped, tampering can be detected
Limitations
  • Lacks native rendering support in web browsers and standard image viewers, requiring specialized software to view
  • Requires blockchain registration at the moment of capture, making it incompatible with existing legacy photos
  • The proprietary nature of the container limits integration to environments supporting the BlockFact SDK
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

FACTI
Use FACTI when…
  • Journalism and Media Authentication
  • Legal and Insurance Evidence
  • AI Deepfake Prevention
  • Content Provenance and Authorship
TGA
Use TGA when…
  • Video Game 3D Textures and Materials
  • 3D Rendering and Animation Sequences
  • Legacy Video Production Workflows

More comparisons

FACTI vs ACES → TGA vs ACES → FACTI vs APNG → TGA vs APNG → FACTI vs AVCI → TGA vs AVCI → FACTI vs AVCS → TGA vs AVCS → FACTI vs AVIF → TGA vs AVIF → All comparisons →
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