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Image MIME Reference
CNS-INF2

Comverse Network Systems INF2 Image

image/vnd.cns.inf2
VS

X Pixmap

image/x-xpixmap
XPM

A complete technical comparison of Comverse Network Systems INF2 Image and X Pixmap — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

Equal browser support

Feature Support

Feature CNS-INF2 XPM
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
Comverse Network Systems INF2 Image
image/vnd.cns.inf2
Extension
.inf2
Container Proprietary Comverse Container
Compression Proprietary
Algorithm
Unknown (Proprietary Telecom Encoding)
Color Depth Unknown
Developed by Comverse Network Systems (Ann McLaughlin)
Released 1999
Magic Bytes
Unknown (Proprietary)
Full CNS-INF2 reference →
X Pixmap
image/x-xpixmap
Extension
.xpm
Container C Source Code Header (.c / .h)
Compression Uncompressed (Source Code)
Algorithm
None
Color Depth Indexed Color (Custom Palette with RGB and Alpha 'None')
Developed by Daniel Dardailler and Colas Nahaboo (Bull / X Consortium)
Released 1989
Magic Bytes
2F 2A 20 58 50 4D 20 2A 2F (ASCII '/* XPM */')
Full XPM reference →

Browser Support Comparison

Browser CNS-INF2 XPM
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕ ✕
Edge Edge
✕ ✕
IE IE (Legacy)
✕
✓
CNS-INF2

CNS-INF2 Strengths

  • Historically allowed Comverse to standardize media transmission internally across their global telecom messaging platforms
Limitations
  • Completely obsolete and non-functional outside of decommissioned telecom infrastructure
  • Undocumented, closed-source binary structure
  • Zero support in modern image processing libraries like ImageMagick, libvips, or FFmpeg
XPM

XPM Strengths

  • Can be compiled directly into C or C++ source code without requiring an external asset loading mechanism
  • Human-readable palette mapping allows developers to inspect, modify, or hand-craft icons directly within a text editor
  • Native support for color palettes and transparency via the 'None' keyword
Limitations
  • Extremely inefficient storage structure for large images, resulting in massive file bloat compared to binary formats like PNG
  • Completely obsolete and unsupported in modern web browsers
  • Parsing overhead requires compiling or interpreting text-based color tables at runtime

When to choose which format

CNS-INF2
Use CNS-INF2 when…
  • Legacy Telecom Infrastructure
  • Historical Comverse Unified Messaging Systems
  • Proprietary Server-to-Server Media Exchange
XPM
Use XPM when…
  • X Window System (X11) Application Icons and Cursors
  • Embedded C/C++ Firmware Color UI Assets
  • Early Linux Desktop Environment Themes

More comparisons

CNS-INF2 vs ACES → XPM vs ACES → CNS-INF2 vs APNG → XPM vs APNG → CNS-INF2 vs AVCI → XPM vs AVCI → CNS-INF2 vs AVCS → XPM vs AVCS → CNS-INF2 vs AVIF → XPM vs AVIF → All comparisons →
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