Kodak Pro SLR/n Raw (.drf)
TIFF-based StandardKodak Pro SLR/n Raw (DRF) is a specialized variant of Kodak's digital camera raw format produced by the Kodak Professional DCS Pro SLR/n full-frame digital camera.
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Inspect & Metadata
Operating systems and file analyzers identify DRF files by inspecting the leading binary byte sequence:
Byte-Level Header Signature (Magic Bytes)
Operating systems and file analyzers identify DRF files by inspecting the leading binary byte sequence:
HEX SIGNATURE (OFFSET 0):
49 49 2A 00ASCII REPRESENTATION: II*\0
Standardization: TIFF-based Kodak proprietary
Technical Specifications
| Container Architecture | TIFF structure with Kodak Pro SLR/n sensor calibration tags |
| Compression | Uncompressed 12-bit / 14-bit linear CMOS sensor data |
| Byte Endianness | Little-Endian (Intel order) |
| Color Spaces | Kodak Pro SLR/n Custom Sensor RGB |
| Channels & Structure | 1 channel Bayer mosaic (RGGB) |
| Max Dimensions | 4500 x 3000 (13.89 MP Full-Frame CMOS) |
| Transparency | None |
| Streaming & Progressive | Non-streamable structured TIFF file |
Technical Comparison Matrix: DRF vs Competitors
| Technical Attribute | DRF (Current) | DCR | NEF | CR2 |
|---|---|---|---|---|
| Mount Compatibility | Nikon F-mount (Kodak body) | Kodak custom body | Nikon F-mount native | Canon EF-mount native |
| Sensor Filter | No optical low-pass filter (OLPF) | No low-pass filter | Optical low-pass filter | Optical low-pass filter |
| Base ISO | ISO 60 (ultra-clean dynamic range) | ISO 80 | ISO 100 / 200 | ISO 100 |
| Resolution | 13.89 Megapixels | 14 Megapixels | 6 - 12 Megapixels | 8 - 16 Megapixels |
Common Corruption Modes & Hex Recovery Guide
Checkerboard patterns across highlights.
Root Cause: Damaged pixel defect table tag in DRF header.
Recovery: Open in File2File Raw Converter or process with dcraw -H 2 broken.drf to reconstruct blown highlights.
Security Analysis & Parser Attack Vectors
DRF files utilize legacy TIFF tag structures that can be exploited if processed by unvalidated C-based raw decoders.
Known Attack Vectors
- Heap overflow in Bayer demosaicing matrix calculations.
- Buffer over-read when parsing damaged Kodak sensor tone curves.
- Denial of service through circular IFD tag chains.
Defensive Best Practices: Convert DRF files to standard DNG or PNG using modern sandboxed client-side converters.
Historical Origins & Milestones
Key Advantages & Pros
- Exceptional optical micro-contrast due to the complete omission of an optical low-pass anti-aliasing filter.
- Pristine native ISO 60 performance beloved by studio and landscape photographers.
- Full 35mm full-frame coverage without crop factor on Nikon F-mount lenses.
Technical Limitations & Cons
- Prone to severe color moire on fine repetitive textiles and architecture without manual post-processing.
- High-ISO performance degrades significantly beyond ISO 400.
- Extremely rare format requiring specialized raw processors or format conversion.
Interesting Technical Trivia
- The Kodak Pro SLR/n used a Nikon F-mount magnesium body based on the Nikon F80 chassis.
- Kodak released a twin model with a Canon EF lens mount called the DCS Pro SLR/c.
- DRF files capture color tonality often compared to Kodak Kodachrome 64 slide film.
Frequently Asked Technical Questions
How does DRF differ from standard Kodak DCR?
DRF contains specific sensor calibration and high-ISO noise reduction matrices tailored specifically for the Kodak DCS Pro SLR/n camera sensor.
Can Photoshop open DRF files?
Modern Photoshop opens DRF files via Adobe Camera Raw, although converting them to DNG guarantees future compatibility.
Why do DRF images have high sharpness?
The Kodak DCS Pro SLR/n sensor omitted the anti-aliasing filter, allowing the sensor to capture maximum lens resolving power directly to the DRF file.