{"id":"image-x-epson-erf","mimeType":"image/x-epson-erf","name":"Epson Raw Format","shortName":"Epson-ERF","category":"Photography \u0026 Raw Imaging","extensions":[".erf"],"description":"The image/x-epson-erf MIME type represents the Epson Raw Format (ERF), a proprietary digital camera raw image format created by Seiko Epson Corporation. Built on top of the standard TIFF/EP architecture, ERF files store uncompressed or losslessly compressed pixel data directly from the camera's image sensor. This format is most famously associated with the Epson R-D1, released in 2004 as the world's first digital rangefinder camera (co-developed with Cosina). Because Epson largely exited the consumer digital camera market shortly after, the format is historically significant but effectively obsolete in modern production workflows.","seo":{"title":"image/x-epson-erf MIME Type | Developer Reference for Epson ERF","description":"Complete reference for the image/x-epson-erf MIME type: Epson Raw Format (ERF), Epson R-D1 digital rangefinder history, TIFF structure, and raw editing.","faqs":[{"question":"What is an Epson ERF file?","answer":"An ERF file is a raw image format created by Epson for its digital cameras, most notably the legendary Epson R-D1 digital rangefinder. It contains unprocessed sensor data, allowing photographers to adjust exposure and white balance without quality loss during post-processing."},{"question":"Is the Epson ERF format still used today?","answer":"No. Epson exited the dedicated consumer digital camera market many years ago. ERF files are now primarily encountered by vintage camera enthusiasts shooting with the classic Epson R-D1 series or archiving historical photographs."},{"question":"How do I open or edit an ERF file?","answer":"Because it is a raw format, standard web browsers and basic image viewers cannot open it. You must use specialized raw processing software such as Adobe Lightroom, Darktable, RawTherapee, or Capture One to 'develop' the image into a standard JPEG or TIFF."}]},"index":{"compression":["Uncompressed","Lossless JPEG (ITU-T81)"],"browserSupport":{"score":1,"label":"None"},"commonUses":["Vintage Digital Photography (Epson R-D1)","Non-destructive Image Post-Processing","Raw Imaging Archival"]},"technical":{"magicBytes":{"hex":"49 49 2A 00 or 4D 4D 00 2A","ascii":"II*\\x00 or MM\\x00*"},"container":"TIFF/EP","compressionAlgorithm":["None","Lossless JPEG"],"colorDepth":["12-bit (Per Channel)"],"transparency":false,"animation":false,"metadata":{"exif":true,"xmp":true,"iccProfile":false},"alphaChannel":false,"progressiveLoading":false,"hdrSupport":true},"history":{"developer":"Seiko Epson Corporation","released":"2004","specification":"Proprietary (TIFF-based, decoded by dcraw/LibRaw)"},"browserSupport":{"chrome":false,"chromeVersion":"None","firefox":false,"firefoxVersion":"None","safari":false,"safariVersion":"None","edge":false,"edgeVersion":"None","internetExplorer":false},"softwareSupport":[{"name":"Adobe Lightroom Classic / CC","logo":""},{"name":"Darktable","logo":""},{"name":"RawTherapee","logo":""},{"name":"ImageMagick","logo":"image-magic.webp"}],"conversion":{"convertTo":["dng","jpeg","tiff","png"],"convertFrom":[]},"developer":{"httpHeaders":[{"header":"Content-Type","value":"image/x-epson-erf"}],"htmlAccept":"image/x-epson-erf, .erf","fileDetection":["ERF files begin with the standard TIFF little-endian (49 49 2A 00) or big-endian (4D 4D 00 2A) magic bytes.","Because ERF shares its header exactly with standard TIFF files and other TIFF-based raw formats, standard file sniffers will initially identify it simply as 'image/tiff'.","To definitively identify an ERF file, a parser must read the TIFF Image File Directory (IFD) EXIF tags and locate the Epson-specific 'MakerNote' string identifying the camera model."]},"prosCons":{"pros":["Preserves original raw sensor data, allowing extreme recovery of highlights and shadows compared to in-camera JPEGs","Utilizes the standard TIFF container structure, making it relatively easy for open-source software (like dcraw and LibRaw) to parse and decode"],"cons":["Completely obsolete proprietary format tied to a defunct line of digital cameras","Requires parsing EXIF metadata to differentiate it from standard TIFF files programmatically","Cannot be natively viewed in web browsers or standard operating system image viewers without specialized codecs"]},"specifications":{"url":"https://www.libraw.org/","rfc":"","mimeAliases":["image/erf"]},"developerSnippets":{"python":"import magic\n# Libmagic will identify ERF files as standard TIFFs due to the shared 49 49 2A 00 / 4D 4D 00 2A header\nprint(magic.from_file('photo.erf', mime=True)) # Outputs 'image/tiff'","nodejs":"const FileType = require('file-type');\nconst type = await FileType.fromFile('photo.erf');\nconsole.log(type?.mime); // Usually resolves to 'image/tiff'. Extension checking is required for 'image/x-epson-erf'.","go":"import (\n    \"bytes\"\n    \"net/http\"\n)\n// Native Go HTTP detection reads the TIFF magic bytes and returns 'image/tiff'.\n// Advanced metadata parsers are required to read the Epson MakerNote EXIF tags.","php":"$mime = mime_content_type('photo.erf');\necho $mime; // Standard PHP installations will resolve this to 'image/tiff'"},"relatedFormats":["tiff"]}