RAF debuted in 2002 with the Fujifilm FinePix S2 Pro, an interchangeable-lens SLR built around Fujifilm’s Super CCD sensor. Unlike the conventional square Bayer grid most camera makers use, Fujifilm’s Super CCD arranged photosites in a diagonal honeycomb pattern, and RAF was designed from the start to carry that unusual sensor geometry along with the metadata needed to reconstruct it. Early RAF files from the S2 Pro era embedded a small fixed-size JPEG preview that could itself be extracted and viewed by tools with no raw support at all.<\/p>
Fujifilm later moved from Super CCD to the X-Trans CMOS sensor, which uses a more complex, larger repeating color filter pattern intended to reduce moir\u00e9 without an optical low-pass filter. RAF carried over as the container for X-Trans data too, which means the format spans two structurally different sensor technologies under one extension \u2014 a detail that matters for any tool trying to decode RAF generically rather than camera-by-camera.<\/p>
For a DAM handling Fujifilm assets, that sensor complexity is the practical issue: X-Trans demosaicing is harder to get right than standard Bayer demosaicing, and different converters visibly disagree on fine detail and color from the same RAF file. Photographers who care about matching Fujifilm’s in-camera film-simulation rendering often reach for Fujifilm’s own X RAW Studio or Capture One rather than a generic converter, which is a reason to keep RAF originals rather than relying solely on an auto-generated DNG proxy for final output.<\/p>","protected":false},"excerpt":{"rendered":"
RAF is Fujifilm’s proprietary raw format, built around the company’s non-Bayer Super CCD and later X-Trans sensor arrays, first shipped on the FinePix S2 Pro in 2002.<\/p>\n","protected":false},"author":0,"featured_media":0,"template":"","meta":{"footnotes":"","faq":[{"question":"Why does RAF need Fujifilm-aware demosaicing rather than generic Bayer decoding?","answer":"Fujifilm sensors use non-standard photosite arrangements, the honeycomb Super CCD and later the X-Trans color filter array, so converters need Fujifilm-aware demosaicing logic, which has made third-party RAF support lag behind Fujifilm's own tools at times."},{"question":"Should a DAM keep the original RAF file even after generating a DNG derivative?","answer":"Yes. Retain the original RAF, since Fujifilm's own X-Trans demosaicing, whether in-camera or via X RAW Studio\/Capture One, can still produce visibly different results from generic converters."},{"question":"Is there a public specification for RAF?","answer":"No. Like most proprietary camera raw formats, RAF has no published specification; support depends on reverse engineering."},{"question":"What does the embedded preview in early RAF files look like?","answer":"On early Fujifilm bodies, it was historically a fixed low-resolution thumbnail, unlike the fuller-size previews some other vendors embed."},{"question":"What Fujifilm-native tool processes RAF using the camera's own image processor?","answer":"Fujifilm X RAW Studio, which offloads raw processing to the camera's own image processor for output matching in-camera JPEG rendering."},{"question":"When was RAF introduced?","answer":"2002, first shipping with the Fujifilm FinePix S2 Pro."},{"question":"Which professional tool is widely used by Fujifilm shooters for RAF processing?","answer":"Capture One, valued for its X-Trans processing quality alongside Adobe Camera Raw\/Lightroom Classic."},{"question":"What should a DAM generate from RAF for interoperability and previews?","answer":"DNG derivatives, since RAF's non-Bayer sensor layouts make faithful third-party decoding harder and DNG is more broadly supported for search and preview generation."}],"checked_date":"2026-08-07","sources":[{"statement":"RAF first appeared on the Fujifilm FinePix S2 Pro, introduced in January 2002, and S2 Pro raw files embed a 1440x960 JPEG preview","source_name":"PaintShop Pro, RAF File Guide","url":"https:\/\/www.paintshoppro.com\/en\/pages\/raf-file\/","checked":"2026-08-07"},{"statement":"Fujifilm's Super CCD sensor and later X-Trans sensor use non-Bayer color filter arrangements that raw converters must handle specifically","source_name":"libopenraw, Fujifilm RAF format notes","url":"https:\/\/libopenraw.freedesktop.org\/formats\/raf\/","checked":"2026-08-07"},{"statement":"Fujifilm X RAW Studio processes RAF files using the camera's own image processor for output consistent with in-camera rendering","source_name":"Adobe, Fujifilm HDR RAF support notes","url":"https:\/\/helpx.adobe.com\/vn_vi\/camera-raw\/using\/fujifilm-hdr-raf-support.html","checked":"2026-08-07"}],"kicker":"","fact_checker":0,"reading_time":0,"revisions":[],"seo_title":"","seo_description":"","noindex":false,"ext":"raf","full_name":"Fujifilm RAW Format","vendor_name":"Fujifilm","introduced":"2002, first shipping with the Fujifilm FinePix S2 Pro","container_notes":"RAF wraps unprocessed sensor data in a proprietary TIFF-like container together with EXIF metadata and an embedded JPEG preview, historically a fixed low-resolution thumbnail on early bodies. Because Fujifilm sensors use non-standard photosite arrangements (the honeycomb Super CCD, later the X-Trans color filter array), converters need Fujifilm-aware demosaicing logic rather than generic Bayer decoding, which has made third-party RAF support lag behind Fujifilm's own tools at times. There is no published specification.","open_with":[{"platform":"Windows \/ macOS","how":"Adobe Camera Raw or Lightroom Classic, with X-Trans-specific demosaicing support"},{"platform":"Professional \/ tethered workflows","how":"Capture One, widely used by Fujifilm shooters for its X-Trans processing"},{"platform":"Fujifilm native","how":"Fujifilm X RAW Studio, which offloads raw processing to the camera's own image processor for output matching in-camera JPEG rendering"},{"platform":"Cross-platform, open source","how":"RawTherapee or darktable via libraw, both with dedicated X-Trans demosaicing algorithms"}],"archive_advice":"RAF is undocumented and its non-Bayer sensor layouts make faithful third-party decoding harder than for standard Bayer raw formats. A DAM should generate DNG derivatives for interoperability and preview generation, but retain the original RAF file since Fujifilm's own X-Trans demosaicing (in-camera or via X RAW Studio\/Capture One) can still produce visibly different results from generic converters.","related":[2605,2610,2594,2597,2598,2600],"tool_link":""},"silo":[23],"class_list":["post-2607","format","type-format","status-publish","hentry","silo-formats"],"_links":{"self":[{"href":"https:\/\/picajet.com\/articles\/wp-json\/wp\/v2\/format\/2607","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/picajet.com\/articles\/wp-json\/wp\/v2\/format"}],"about":[{"href":"https:\/\/picajet.com\/articles\/wp-json\/wp\/v2\/types\/format"}],"version-history":[{"count":3,"href":"https:\/\/picajet.com\/articles\/wp-json\/wp\/v2\/format\/2607\/revisions"}],"predecessor-version":[{"id":3665,"href":"https:\/\/picajet.com\/articles\/wp-json\/wp\/v2\/format\/2607\/revisions\/3665"}],"wp:attachment":[{"href":"https:\/\/picajet.com\/articles\/wp-json\/wp\/v2\/media?parent=2607"}],"wp:term":[{"taxonomy":"silo","embeddable":true,"href":"https:\/\/picajet.com\/articles\/wp-json\/wp\/v2\/silo?post=2607"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}