{"id":"image-x-panasonic-raw","mimeType":"image/x-panasonic-raw","name":"Panasonic RAW Image","shortName":"Panasonic-RAW-(RW2)","category":"Photography \u0026 Raw Imaging","extensions":[".raw",".rw2"],"description":"The image/x-panasonic-raw MIME type represents the proprietary raw image formats developed by Panasonic for its Lumix line of digital cameras. Early Panasonic cameras used the .raw extension, which was later superseded by the .rw2 format in modern Lumix G and S series cameras. These files contain minimally processed, uncompressed or losslessly compressed data directly from the camera's image sensor. Built on a TIFF-like structure, they retain maximum dynamic range, color depth, and essential metadata (such as lens correction profiles and white balance), allowing photographers extensive non-destructive editing capabilities.","seo":{"title":"image/x-panasonic-raw MIME Type | Developer Reference for Panasonic RW2","description":"Complete reference for the image/x-panasonic-raw MIME type: Panasonic Lumix RAW and RW2 formats, TIFF structure, raw sensor data, and file detection.","faqs":[{"question":"What is a Panasonic RAW or RW2 file?","answer":"It is a raw image file generated by Panasonic Lumix digital cameras. It contains unprocessed sensor data, capturing much more detail, dynamic range, and color information than a standard in-camera JPEG."},{"question":"What is the difference between Panasonic .raw and .rw2?","answer":"They are both proprietary raw formats from Panasonic. The .raw extension was used on early Lumix models. Panasonic later introduced the updated .rw2 format for its modern interchangeable lens cameras to support newer sensor technologies and better compression."},{"question":"How do I open a Panasonic RW2 file?","answer":"Because it is a raw format, standard web browsers cannot open it. You must use specialized raw processing software such as Adobe Lightroom, Capture One, RawTherapee, or Panasonic's official SILKYPIX Developer Studio."}]},"index":{"compression":["Uncompressed","Panasonic Proprietary Lossless"],"browserSupport":{"score":1,"label":"None"},"commonUses":["Professional Digital Photography","Non-destructive Image Post-Processing","High Dynamic Range (HDR) Lumix Archival"]},"technical":{"magicBytes":{"hex":"Older RAW: 49 49 2A 00 | Newer RW2: 49 49 55 00","ascii":"II*\\x00 or IIU\\x00"},"container":"TIFF-based (Proprietary)","compressionAlgorithm":["None","Proprietary Lossless"],"colorDepth":["12-bit (Per Channel)","14-bit (Per Channel)","16-bit (Per Channel - High-res mode)"],"transparency":false,"animation":false,"metadata":{"exif":true,"xmp":true,"iccProfile":true},"alphaChannel":false,"progressiveLoading":false,"hdrSupport":true},"history":{"developer":"Panasonic Corporation","released":"2004","specification":"Proprietary (Reverse-engineered by the community / LibRaw)"},"browserSupport":{"chrome":false,"chromeVersion":"None","firefox":false,"firefoxVersion":"None","safari":false,"safariVersion":"None","edge":false,"edgeVersion":"None","internetExplorer":false},"softwareSupport":[{"name":"SILKYPIX Developer Studio SE","logo":""},{"name":"Adobe Lightroom Classic / CC","logo":""},{"name":"Capture One","logo":""},{"name":"RawTherapee","logo":""}],"conversion":{"convertTo":["dng","jpeg","tiff","png"],"convertFrom":[]},"developer":{"httpHeaders":[{"header":"Content-Type","value":"image/x-panasonic-raw"},{"header":"Content-Type","value":"image/x-panasonic-rw2"}],"htmlAccept":"image/x-panasonic-raw, .raw, .rw2","fileDetection":["Older Panasonic .raw files use the standard TIFF little-endian header (49 49 2A 00).","Modern Panasonic .rw2 files intentionally alter the TIFF header to distinguish themselves, using the signature 'IIU\\x00' (Hex: 49 49 55 00).","Because of the RW2 signature change, it is much easier to programmatically identify modern Panasonic raw files without needing to parse the EXIF MakerNotes."]},"prosCons":{"pros":["Retains maximum sensor data, allowing significant recovery of highlights and shadows compared to in-camera JPEGs","Modern RW2 files embed proprietary lens correction profiles (distortion, vignetting, chromatic aberration) that raw converters can automatically apply","The unique 'IIU' signature on RW2 files makes programmatic identification extremely reliable compared to other TIFF-spoofing raw formats"],"cons":["Proprietary format requires continuous updates to third-party processing engines whenever Panasonic releases a new Lumix camera","Produces very large file sizes, particularly when using Panasonic's High-Resolution multi-shot modes","Cannot be directly embedded into web pages or used in standard HTML/CSS contexts"]},"specifications":{"url":"https://www.libraw.org/","rfc":"","mimeAliases":["image/x-panasonic-rw2","image/rw2"]},"developerSnippets":{"python":"import magic\n# Libmagic can distinguish RW2 files due to their unique 'IIU' header\nprint(magic.from_file('photo.rw2', mime=True)) # Outputs 'image/x-panasonic-rw2' or 'image/x-panasonic-raw'","nodejs":"const fs = require('fs');\n// Manually detecting the 4-byte Panasonic RW2 magic signature\nconst buffer = Buffer.alloc(4);\nconst fd = fs.openSync('photo.rw2', 'r');\nfs.readSync(fd, buffer, 0, 4, 0);\nfs.closeSync(fd);\nconst isRW2 = buffer[0] === 0x49 \u0026\u0026 buffer[1] === 0x49 \u0026\u0026 buffer[2] === 0x55 \u0026\u0026 buffer[3] === 0x00; // I, I, U, \\x00\nconsole.log('Is Panasonic RW2:', isRW2);","go":"import (\n    \"bytes\"\n    \"net/http\"\n)\n// Native Go HTTP detection might return application/octet-stream.\n// Check directly for the explicit 4-byte RW2 signature:\n// isRW2 := bytes.HasPrefix(buf, []byte{0x49, 0x49, 0x55, 0x00})","php":"$mime = mime_content_type('photo.rw2');\necho $mime; // Standard PHP setups with updated magic definitions will return 'image/x-panasonic-rw2'"},"relatedFormats":["olympus-orf","sony-arw","dng","tiff"]}