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RAF converter

A .raf file is a Fujifilm RAW photograph, notable because Fujifilm's sensors have repeatedly broken with convention, from rotated SuperCCD photosites to the X-Trans color filter array. Decoding a .raf therefore demands sensor-specific logic that generic Bayer pipelines do not have, which historically made Fujifilm support the acid test for raw converters.

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Drop RAF files here

Batch files can each use a different output. Nothing uploads for local conversions.

Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.

Where RAF comes from

Fujifilm has written RAF since its late-1990s FinePix cameras, whose SuperCCD sensors used octagonal photodiodes rotated 45 degrees. The 2012 X-Pro1 introduced the X-Trans sensor with its 6x6 pseudo-random filter pattern designed to suppress moire without an optical low-pass filter, and X-Trans remains the signature of the X-series today, while GFX medium-format bodies use conventional Bayer.

How RAF works

  • Proprietary header preceding a large embedded JPEG and the CFA sensor data block
  • X-Trans sensors use a 6x6 color filter mosaic instead of the 2x2 Bayer pattern, requiring dedicated demosaicing algorithms
  • 14-bit readout on current X and GFX bodies, with optional lossless compression introduced in later generations
  • SuperCCD-era files store diagonal photosite grids that decoders must rotate and interpolate
  • GFX medium-format RAFs reach 100+ megapixels with 16-bit output modes

When to use RAF

  • Developing X-series photos where film-simulation flexibility is wanted after capture
  • Medium-format GFX workflows demanding maximum resolution and depth
  • Fixing moire-free fine detail — textiles, architecture — that X-Trans excels at

Strengths and limitations

Strengths

  • X-Trans design suppresses moire without a resolution-sapping low-pass filter
  • In-camera film simulations remain re-applicable during raw development
  • 14-16 bit capture with lossless compression on current bodies

Limitations

  • X-Trans demosaicing is computationally heavier and varies in quality between converters
  • Some processors historically rendered X-Trans foliage with smeared 'watercolor' detail
  • Unusual sensor layouts delay or complicate support in smaller tools

Compatibility

Lightroom, Capture One, DxO PureRAW, darktable, and RawTherapee all decode current RAF variants, with X-Trans rendering quality differing enough that Fujifilm shooters actively compare engines. OS-level previews cover mainstream models, and in-browser conversion depends on LibRaw's WebAssembly builds, which include X-Trans demosaicing.

EXIF plus Fujifilm MakerNotes recording film simulation, dynamic-range mode, and focus data are embedded, with XMP handled through sidecars in most editors.

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