Free webp to jpg
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Image MIME Reference
JPEG

JPEG Image

image/jpeg
VS

Silicon Graphics Image

image/sgi
SGI

A complete technical comparison of JPEG Image and Silicon Graphics Image — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

JPEG wins on browser support

Feature Support

Feature JPEG SGI
Transparency (Alpha) ✕ No Yes
Animation Support ✕ No ✕ No
Progressive Loading Yes ✕ No
HDR Support ✕ No ✕ No
EXIF Metadata Yes ✕ No
ICC Color Profile Yes ✕ No
JPEG Image
image/jpeg
Extension
.jpg.jpeg.jpe.jfif
Container JFIF / Exif
Compression Lossy
Algorithm
DCT (Discrete Cosine Transform)
Color Depth 8-bit
Developed by Joint Photographic Experts Group
Released 1992
Magic Bytes
FF D8 FF
Full JPEG reference →
Silicon Graphics Image
image/sgi
Extension
.sgi.rgb.rgba.bw.int.inta
Container SGI Image Format
Compression Uncompressed / Lossless (Run-Length Encoding)
Algorithm
RLENone
Color Depth 8-bit, 16-bit (Per Channel)
Developed by Paul Haeberli (Silicon Graphics)
Released 1990
Magic Bytes
01 DA
Full SGI reference →

Browser Support Comparison

Browser JPEG SGI
Chrome Chrome
✓ All
 ✕
Firefox Firefox
✓ All
 ✕
Safari Safari
✓ All
 ✕
Edge Edge
✓ All
 ✕
IE IE (Legacy)
✓
 ✕
JPEG

JPEG Strengths

  • Universal support — every browser, OS, and application handles JPEG
  • Excellent compression for complex photographs with natural color gradients
  • Rich metadata support: EXIF (GPS, camera settings), ICC color profiles
Limitations
  • No transparency — cannot have a transparent background
  • Lossy compression introduces visible artifacts on sharp edges and text
  • No animation support
SGI

SGI Strengths

  • Pioneered multi-channel and 16-bit per channel imaging capabilities required for high-end 1990s visual effects
  • Extremely robust and simple header structure
  • Reliable Run-Length Encoding provided solid lossless compression for flat-shaded 3D renders
Limitations
  • Completely obsolete for modern web and application development
  • Zero native web browser compatibility
  • Largely replaced by TIFF and OpenEXR in modern professional VFX and 3D pipelines

When to choose which format

JPEG
Use JPEG when…
  • Photography
  • Websites
  • Social Media
  • Print
SGI
Use SGI when…
  • Legacy 3D Animation & VFX
  • Silicon Graphics IRIX Workflows
  • Historical CGI Archiving

More comparisons

JPEG vs ACES → SGI vs ACES → JPEG vs APNG → SGI vs APNG → JPEG vs AVCI → SGI vs AVCI → JPEG vs AVCS → SGI vs AVCS → JPEG vs AVIF → SGI vs AVIF → All comparisons →
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