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Image MIME Reference
JPEG-XR-Sequence

JPEG XR Image Sequence (HEIF Container)

image/jxrs
VS

Truevision TGA (Legacy MIME Alias)

image/x-tga
TGA

A complete technical comparison of JPEG XR Image Sequence (HEIF Container) 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 JPEG-XR-Sequence TGA
Transparency (Alpha) Yes Yes
Animation Support Yes ✕ No
Progressive Loading Yes ✕ No
HDR Support Yes ✕ No
EXIF Metadata Yes ✕ No
ICC Color Profile Yes ✕ No
JPEG XR Image Sequence (HEIF Container)
image/jxrs
Extension
.jxrs
Container HEIF / ISOBMFF (ISO/IEC 23008-12 / Annex F of ITU-T T.832)
Compression Lossy / Lossless
Algorithm
JPEG XR (Lapped Biorthogonal Transform)
Color Depth 8-bit, 16-bit, 32-bit (Float)
Developed by ISO/IEC JTC 1 / ITU-T
Released 2019
Magic Bytes
XX XX XX XX 66 74 79 70 6A 78 72 53
Full JPEG-XR-Sequence 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 JPEG-XR-Sequence TGA
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕ ✕
Edge Edge
✕ ✕
IE IE (Legacy)
✕ ✕
JPEG-XR-Sequence

JPEG-XR-Sequence Strengths

  • Supports 32-bit floating point HDR color depths natively across an entire animation sequence
  • Combines the advanced coding efficiencies of JPEG XR with the sequence timing and metadata framework of HEIF
  • Shares frame data structures allowing for optimized storage of burst photography
Limitations
  • Extremely rare format with essentially no mainstream software adoption
  • Zero web browser support
  • Overshadowed heavily by HEVC (HEIC sequences) and AV1 (AVIF sequences) which offer superior compression and broader hardware decoding support
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

JPEG-XR-Sequence
Use JPEG-XR-Sequence when…
  • Experimental Animation Workflows
  • HDR Burst Photography Archiving
  • Specialized Medical & Scientific Imaging
TGA
Use TGA when…
  • Video Game 3D Textures and Materials
  • 3D Rendering and Animation Sequences
  • Legacy Video Production Workflows

More comparisons

JPEG-XR-Sequence vs ACES → TGA vs ACES → JPEG-XR-Sequence vs APNG → TGA vs APNG → JPEG-XR-Sequence vs AVCI → TGA vs AVCI → JPEG-XR-Sequence vs AVCS → TGA vs AVCS → JPEG-XR-Sequence vs AVIF → TGA vs AVIF → All comparisons →
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