The RAF Fujifilm RAW Format

The native RAW format of Fujifilm X-series cameras and their X-Trans sensors

Last updated: June 26, 2026

RAF is the RAW file format used by Fujifilm's acclaimed X-series cameras. What makes it distinctive is that many Fuji sensors use the unusual non-Bayer X-Trans colour filter array instead of a standard Bayer grid, a difference that some RAW converters handle in their own way. RAF files are beloved by photographers drawn to Fujifilm's celebrated film-simulation looks and rangefinder-style handling. Because a RAF stores unprocessed sensor data rather than a finished picture, it must be converted to a common format such as JPG or PNG before it can be shared online or printed.

What is RAF?

RAF is the proprietary RAW format produced by Fujifilm's X-series digital cameras. As with any RAW type, a RAF file is not a finished photograph but a record of the raw data read from the image sensor, captured before demosaicing, white balance, sharpening, or compression turn it into a viewable image. Saving everything the sensor measured leaves the creative interpretation to you in software.

Files carry the .raf extension and preserve high-bit-depth tonal information, giving wide latitude to adjust exposure and colour after the shot. What sets RAF apart from most other RAW formats is the sensor behind it: many Fujifilm cameras use the X-Trans colour filter array, which arranges red, green, and blue filters in a larger, more random-looking pattern than the conventional Bayer grid. That unusual layout affects how the raw data must be reconstructed, which is why RAF is sometimes treated specially by converters. At heart, though, a RAF is still a digital negative waiting to be developed.

Fujifilm RAW: Background

Fujifilm built the X-series around a blend of retro, rangefinder-inspired design and modern mirrorless technology, and RAF is the RAW format that grew with it. A defining moment came when Fujifilm introduced its X-Trans sensor, breaking from the industry-standard Bayer array in pursuit of reduced moire and a distinctive rendering. RAF files from those cameras therefore carry a colour pattern unlike almost anything else on the market.

The other half of Fujifilm's identity is colour. Drawing on the company's long history making photographic film, Fujifilm baked beloved film-simulation profiles into its cameras, and photographers often choose the brand specifically for those looks. The RAF format underpins this: it preserves the full sensor data so users can apply or refine those film-inspired renderings during processing. For the dedicated Fuji community, RAF is inseparable from the X-series experience of tactile dials, classic styling, and signature colour science.

How RAF Works

When a Fujifilm X-series camera exposes a frame, light reaches a sensor covered by a colour filter array. On most Fuji bodies this is the X-Trans array rather than a Bayer grid, and a RAF file stores each pixel's raw single-colour reading before any full-colour image is built.

• X-Trans capture: Filters are arranged in a 6 by 6 pattern rather than the usual 2 by 2 Bayer block.
• Raw values stored: Each pixel keeps a high-bit-depth brightness reading for one colour channel.
• Embedded data: Camera settings, the chosen film simulation, and a preview are saved inside.
• Specialised demosaicing: Converters must interpret the X-Trans layout, which some handle better than others.

Because the X-Trans pattern differs from Bayer, the demosaicing step is more complex, and different RAW software can produce subtly different detail and colour from the same RAF. Converting to JPG or PNG runs that reconstruction, applies your tone and colour choices, and outputs a standard image any device can display.

Key Features of RAF

RAF combines the usual benefits of RAW capture with traits unique to the Fujifilm system:

• X-Trans sensor data: A distinctive non-Bayer pattern aimed at reducing moire without an optical low-pass filter.
• Unprocessed capture: White balance, sharpening, and noise reduction all remain editable.
• Film-simulation friendly: Full sensor data lets you apply or rework Fujifilm's signature colour profiles.
• High-bit-depth latitude: Ample room to recover highlights and shadows in editing.
• Embedded preview and metadata: A built-in thumbnail plus complete shooting information.

This mix appeals to photographers who care deeply about colour rendering and want the flexibility of RAW alongside Fujifilm's distinctive aesthetic. The X-Trans approach is a defining technical feature, so when choosing editing software it is worth confirming that the converter reconstructs X-Trans files cleanly to get the most from each RAF.

Why Convert RAF Files?

A RAF is an editing master, not a ready-to-use picture, so converting it is the practical next step in nearly every workflow:

• Limited compatibility: Browsers, phones, and basic viewers usually cannot open .raf files.
• Sharing online: Social media, messaging, and email expect JPG or PNG.
• Printing: Labs and home printers require a standard processed format.
• File size: A converted JPG is far smaller than the original RAF.
• X-Trans support: Some older software handles X-Trans poorly, so converting with capable tools matters.

Converting to JPG yields a compact, universally readable image ideal for posting and sharing, while PNG suits cases needing lossless output. Keeping the original RAF archived means you can always revisit the full sensor data, apply a different film simulation, or re-process with improved X-Trans-aware software in the future.

RAF vs JPEG and Other Formats

The key comparison is with JPEG. A Fujifilm JPEG is especially attractive because the camera applies a film simulation, white balance, and sharpening in-camera, producing a polished 8-bit file that many Fuji shooters use straight away. But that processing is permanent and the file discards data. A RAF keeps the full sensor readout, letting you change the film look or recover detail later, at the cost of larger files and a conversion step.

Against other RAW formats, RAF stands out because of X-Trans: where CR3, NEF, and ORF generally come from Bayer sensors, most RAF files come from the X-Trans array and need converters that understand it. The open DNG standard can store the data for archival use, and RAF can be converted to DNG. Compared with PNG or TIFF, RAF is not a competitor but a source: those are processed outputs you create when you develop a RAF into a final image.

Tips for Working with RAF

These tips help you get the best from Fujifilm RAW files:

• Shoot RAW plus JPEG: Fuji's in-camera film simulations make the JPEG genuinely useful for instant sharing while the RAF stays as your master.
• Choose X-Trans-aware software: Use a converter known to demosaic X-Trans cleanly for the sharpest, most natural results.
• Explore film simulations: Apply or adjust profiles like the classic Fujifilm looks during conversion rather than locking them in.
• Mind fine detail: X-Trans renders foliage and textures differently, so review sharpening at full size.
• Export for purpose: Convert to JPG for sharing and PNG when you need lossless quality.

Treating the RAF as your negative and the export as the print preserves Fujifilm's colour character while keeping your editing options open.

RAF at a Glance

Advantages of RAF

• Stores unprocessed X-Trans sensor data for full editing control
• Preserves the flexibility to apply or rework Fujifilm film simulations
• High-bit-depth latitude for recovering highlights and shadows
• X-Trans array helps reduce moire without an optical low-pass filter

Limitations of RAF

• X-Trans files demand converters that demosaic them well
• Cannot be opened directly in most everyday apps without conversion
• Significantly larger than a finished JPEG of the same shot

Convert RAF to Another Format

Use Snap2Format's free converter to turn your RAF files into any of these formats — no signup, no watermark:

RAF — Frequently Asked Questions

Explore Other Image Formats

Learn about the formats most often used alongside RAF:

📖 Related reading: How to Convert RAW Photos to JPG Without Losing Quality.

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