Sony’s path to ARW ran through two earlier, short-lived raw formats: SRF, which appeared in January 2004 with the Cyber-shot DSC-F828, and SR2, introduced in December 2005 with the DSC-R1. ARW itself launched in July 2006 alongside the Alpha DSLR-A100, Sony’s first Alpha-series DSLR (built on Konica Minolta’s camera technology after Sony acquired that business), and has remained Sony’s standard raw format across the Alpha DSLR and mirrorless lines ever since.<\/p>
For a DAM, ARW behaves much like NEF or CR2 \u2014 a TIFF-based container with an embedded preview and MakerNotes that mainstream raw processors handle well given its now-lengthy track record. The one archival trap specific to Sony is format continuity across the SRF\/SR2\/ARW transition: a photo library that includes early-2000s Sony captures may have SRF or SR2 files mixed in among the far more common ARW files, and those older formats have much thinner software support today, making them a genuine risk for a DAM performing long-term preservation rather than just current-camera ingestion.<\/p>","protected":false},"excerpt":{"rendered":"
Sony’s current TIFF-based RAW format for Alpha-series cameras, replacing the earlier SRF (2004) and SR2 (2005) formats, storing 12- or 14-bit raw sensor data with an embedded preview and Exif\/MakerNotes metadata.<\/p>\n","protected":false},"author":0,"featured_media":0,"template":"","meta":{"footnotes":"","faq":[{"question":"What preceded ARW as Sony's raw format?","answer":"Sony's raw lineage began with SRF, introduced in January 2004 with the Cyber-shot DSC-F828 and also used in the DSC-V3, followed by SR2 in December 2005 with the DSC-R1. Both were proprietary TIFF-based formats confined to a few high-end Cyber-shot compacts. ARW superseded them in July 2006, launching as version 1.0 alongside the Alpha DSLR-A100, Sony's first Alpha-series DSLR."},{"question":"Does ARW use one fixed internal layout across all Sony camera generations?","answer":"No. ARW has gone through several internal revisions since its 2006 debut: version 1.0 stored 12-bit uncompressed data, version 2.1 added 12-bit lossy-compressed cRAW in 2008, version 2.3 moved to 14-bit depth in 2012 with the SLT-A99, and version 4.0 introduced lossless compression in 2021 with the Alpha 1. Each shift means decoding software needs per-version updates rather than a single fixed parser."},{"question":"Should a DAM treat old Sony SRF\/SR2 files the same as ARW?","answer":"No. SRF (used in the 2004 DSC-F828 and DSC-V3) and SR2 (the 2005 DSC-R1) are genuinely separate legacy formats that predate ARW's 2006 debut, with their own internal structure including encrypted MakerNote segments. A DAM that ingests early Sony raw captures should identify and handle them distinctly from ARW rather than assuming shared parsing rules, since generic ARW decoders may not read them reliably."},{"question":"What bit depths does ARW capture at?","answer":"ARW has captured at different bit depths as the format matured: 12-bit uncompressed with the original 2006 version 1.0, 12-bit lossy-compressed cRAW from version 2.1 in 2008, and 14-bit from version 2.3, introduced in 2012 with the SLT-A99. Version 4.0 added lossless compression in 2021. Current Sony bodies typically shoot 14-bit ARW, with a camera-menu choice between compressed and uncompressed capture."},{"question":"Is ARW structurally TIFF-based?","answer":"Yes. Like most vendor raw formats, ARW is built on the TIFF structure, using Intel little-endian byte order and IFD-style directory entries. Each file typically carries an embedded JPEG preview for fast thumbnailing, standard Exif metadata, and a nested Sony MakerNotes block that stores camera-specific parameters, some of it in encrypted sections. This TIFF foundation is why many generic TIFF-aware readers can extract basic metadata even without full raw decoding support."},{"question":"Should a DAM convert ARW masters to DNG?","answer":"Not urgently. ARW is stable and widely supported after two decades of use, so no urgent conversion is needed for active archives, though a DNG pass is still recommended for cross-brand DAM collections."},{"question":"What native Sony software opens ARW?","answer":"Sony Imaging Edge Desktop is the current native application, bundling viewing, raw processing, and remote-capture tools; it succeeded Sony's older Image Data Converter software. Beyond Sony's own ecosystem, ARW is also widely supported by cross-vendor tools, including Adobe Camera Raw and Lightroom Classic, Capture One, and open-source options like RawTherapee and darktable, which cover the format's various version revisions with periodic updates."},{"question":"When was ARW introduced?","answer":"ARW 1.0 launched in July 2006 together with the Sony Alpha DSLR-A100, Sony's first Alpha-series DSLR and its entry into the interchangeable-lens camera market following its acquisition of Konica Minolta's camera business. The format has remained Sony's standard raw container ever since, carried forward through later revisions such as ARW 2.3 and ARW 4.0 as newer camera bodies and sensor technologies arrived."}],"checked_date":"2026-08-11","sources":[{"statement":"ARW is Sony's proprietary RAW image format, introduced in 2006 with the Alpha DSLR-A100.","source_name":"PeasyImage - ARW Format, Sony Alpha Raw Images Explained","url":"https:\/\/peasyimage.com\/formats\/arw\/","checked":"2026-08-07"},{"statement":"Sony's raw format history runs SRF (January 2004, DSC-F828), then SR2 (December 2005, DSC-R1), then ARW (July 2006, Alpha DSLR-A100).","source_name":"GitHub - lclevy\/sony_raw: Description of Sony RAW file formats (SRF, SR2 and ARW)","url":"https:\/\/github.com\/lclevy\/sony_raw","checked":"2026-08-07"},{"statement":"SR2 was an early proprietary Sony raw format used for select models including the Cyber-shot DSC-R1, released in 2005.","source_name":"Wikipedia - Sony Cyber-shot DSC-R1","url":"https:\/\/en.wikipedia.org\/wiki\/Sony_Cyber-shot_DSC-R1","checked":"2026-08-07"}],"kicker":"","fact_checker":0,"reading_time":0,"revisions":[],"seo_title":"ARW file: Sony raw format, how to open and convert it","seo_description":"","noindex":false,"ext":"arw","full_name":"Sony Alpha Raw","vendor_name":"Sony","introduced":"July 2006, with the Sony Alpha DSLR-A100","container_notes":"ARW is a TIFF-derived container carrying an embedded JPEG preview, standard Exif data, and Sony-specific MakerNotes; newer bodies offer both lossless-compressed and uncompressed ARW capture options. Like other vendor RAW formats, the exact internal layout has shifted somewhat across camera generations, so decoding software needs per-model updates rather than a single fixed parser.","open_with":[{"platform":"Sony native","how":"Sony Imaging Edge Desktop"},{"platform":"Cross-vendor commercial","how":"Adobe Camera Raw \/ Lightroom Classic"},{"platform":"Cross-vendor commercial","how":"Capture One"},{"platform":"Open source","how":"RawTherapee and darktable"}],"archive_advice":"ARW is stable and widely supported after two decades of use, so no urgent conversion is needed for active archives; still recommend a DNG conversion pass for cross-brand DAM collections. Note that Sony's older SRF\/SR2 files, used before ARW's 2006 debut, are a genuinely separate legacy format and need distinct handling if a collection includes early Sony raw captures.","related":[2599,2593,2609,2591,2594,2601],"tool_link":""},"silo":[23],"class_list":["post-2603","format","type-format","status-publish","hentry","silo-formats"],"_links":{"self":[{"href":"https:\/\/picajet.com\/articles\/wp-json\/wp\/v2\/format\/2603","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\/2603\/revisions"}],"predecessor-version":[{"id":3661,"href":"https:\/\/picajet.com\/articles\/wp-json\/wp\/v2\/format\/2603\/revisions\/3661"}],"wp:attachment":[{"href":"https:\/\/picajet.com\/articles\/wp-json\/wp\/v2\/media?parent=2603"}],"wp:term":[{"taxonomy":"silo","embeddable":true,"href":"https:\/\/picajet.com\/articles\/wp-json\/wp\/v2\/silo?post=2603"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}