Image MIME Reference
BTIF
Bank Telecommunications Image Format
image/prs.btif
VS
Windows Enhanced Metafile
image/x-emf
EMF
A complete technical comparison of Bank Telecommunications Image Format and Windows Enhanced Metafile — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.
Equal browser support
Feature Support
| Feature | BTIF | EMF |
|---|---|---|
| Transparency (Alpha) | ✕ No | Yes |
| Animation Support | ✕ No | ✕ No |
| Progressive Loading | ✕ No | ✕ No |
| HDR Support | ✕ No | ✕ No |
| EXIF Metadata | ✕ No | ✕ No |
| ICC Color Profile | ✕ No | Yes |
Bank Telecommunications Image Format
image/prs.btif
Extension
.btif.btf
Container
Proprietary Check Image Container
Compression
Lossy (JPEG-based) / Lossless (TIFF-based)
Algorithm
JPEGTIFF-variant
Color Depth
1-bit (B&W), 8-bit (Grayscale)
Developed by
NationsBank (Bank of America) / Ben Simon
Released
1998
Magic Bytes
Unknown (Proprietary container)
Windows Enhanced Metafile
image/x-emf
Extension
.emf
Container
Windows GDI/GDI+ Record Sequence
Compression
Uncompressed (Binary Drawing Records)
Algorithm
None
Color Depth
Vector (32-bit GDI/GDI+ Colors), Supports embedded 24-bit/32-bit bitmaps
Developed by
Microsoft Corporation
Released
1993
Magic Bytes
01 00 00 00 (Header Type) ... 20 45 4D 46 (Signature at offset 40)
Browser Support Comparison
| Browser | BTIF | EMF |
|---|---|---|
Chrome
|
✕ | ✕ |
Firefox
|
✕ | ✕ |
Safari
|
✕ | ✕ |
Edge
|
✕ | ✕ |
IE (Legacy)
|
✕ |
✓
|
BTIF
BTIF Strengths
- Allowed early digital archiving and web-based transmission of cleared bank checks
- Encapsulated both image data and ASCII transaction metadata in a single file
Limitations
- Completely proprietary and obsolete format
- Lacks native support in modern operating systems and image viewers
- Requires legacy plugins or specialized bio-format readers (like ImageC) to decode
EMF
EMF Strengths
- Device independent, meaning it renders consistently across different monitors and printers regardless of resolution
- Fully supports 32-bit precision and advanced GDI+ drawing commands, including alpha transparency and anti-aliasing (EMF+)
- Native rendering within the Windows OS ensures fast performance and flawless fidelity in Microsoft Office applications
Limitations
- Heavily tied to the Windows Graphics Device Interface API, making it notoriously difficult to parse perfectly on macOS or Linux
- Completely unsupported by modern web standards; cannot be embedded in HTML without conversion to SVG
- Security history: Like WMF, malicious drawing records can theoretically exploit vulnerabilities in older GDI parsers
When to choose which format
BTIF
Use BTIF when…
- Bank Check Archiving (Legacy)
- Financial Transaction Records
EMF
Use EMF when…
- Microsoft Office Vector Graphics and Clip Art
- Windows Print Spooling (EMF Spool Files)
- High-fidelity Vector Interchange on Windows