Image MIME Reference
CNS-INF2
Comverse Network Systems INF2 Image
image/vnd.cns.inf2
VS
High Efficiency Image File Format
image/heif
HEIF
A complete technical comparison of Comverse Network Systems INF2 Image and High Efficiency Image File Format — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.
Equal browser support
Feature Support
| Feature | CNS-INF2 | HEIF |
|---|---|---|
| Transparency (Alpha) | ✕ No | Yes |
| Animation Support | ✕ No | Yes |
| Progressive Loading | ✕ No | ✕ No |
| HDR Support | ✕ No | Yes |
| EXIF Metadata | ✕ No | Yes |
| ICC Color Profile | ✕ No | Yes |
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)
High Efficiency Image File Format
image/heif
Extension
.heif.hif
Container
HEIF / ISOBMFF (ISO/IEC 14496-12)
Compression
Lossy / Lossless
Algorithm
Codec Agnostic (HEVC, AVC, JPEG, AV1)
Color Depth
8-bit, 10-bit, 12-bit, 16-bit
Developed by
Moving Picture Experts Group (MPEG)
Released
2015
Magic Bytes
XX XX XX XX 66 74 79 70 6D 69 66 31
Browser Support Comparison
| Browser | CNS-INF2 | HEIF |
|---|---|---|
Chrome
|
✕ | ✕ |
Firefox
|
✕ | ✕ |
Safari
|
✕ | ✕ |
Edge
|
✕ | ✕ |
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
HEIF
HEIF Strengths
- Highly flexible container that can store image bursts, animations, focal stacks, and stereo 3D images in one file
- Natively supports depth maps and alpha channels, making it perfect for computational photography
- When paired with modern codecs like HEVC or AV1, it provides massive storage savings over legacy formats like JPEG
Limitations
- Codec agnosticism makes broad software decoding difficult, as the container might hold proprietary or unsupported codecs
- Zero cross-platform web browser support, requiring conversion for online publishing
- Often confused with the more specific 'image/heic' and 'image/avif' MIME types
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
HEIF
Use HEIF when…
- Digital Photography
- Camera Capture
- Image Archiving
- Multi-image composites