RW2

No. Panasonic has never published an RW2 format specification, unlike DNG's public spec. Vendors building RW2 support—Adobe, RawTherapee, darktable, LibRaw—rely entirely on reverse-engineering camera output, since LibRaw began recognizing RW2 around October 2009. This means DAM tools depend on third-party libraries maintaining ongoing reverse-engineering work rather than implementing against documented Panasonic tag definitions, sensor layouts, or compression algorithms.

No. Although RW2 stores its header and metadata in a TIFF-derived container, Panasonic modified the file signature and used non-standard, proprietary tag numbers that don't match the baseline TIFF 6.0 specification. A generic TIFF parser will typically read the container structure but fail to locate or correctly interpret the actual Bayer sensor data and Panasonic-specific MakerNote fields, requiring RW2-aware decoding logic instead.

Convert them to DNG using Adobe's free DNG Converter and store the DNG as the durable access copy, keeping the original RW2 only where bit-exact re-processing in Panasonic's own software might matter.

RW2 stores 12-bit Bayer-pattern data on older Lumix models and 14-bit on newer ones, capturing raw sensor readout before demosaicing. Panasonic applies its own proprietary compression, offering both lossless and lossy modes depending on the camera body and firmware. Files also embed standard EXIF metadata alongside an embedded JPEG preview, plus extensive Panasonic MakerNote tags covering lens data, image stabilization, and Photo Style settings.

Panasonic introduced RW2 in 2008 alongside the Lumix DMC-G1, the world's first Micro Four Thirds mirrorless camera, replacing the earlier .RAW extension used on prior Panasonic and Leica-co-branded models. The format has since been carried across the entire Lumix G-series and full-frame S-series lineup. LibRaw and dcraw began recognizing RW2 files around October 2009, roughly a year after the format's debut.

Panasonic ships a SILKYPIX-based raw converter bundled with its cameras for native RW2 processing. Beyond Panasonic's own tools, RW2 support is widely available through Adobe Camera Raw and Lightroom Classic, the open-source RawTherapee and darktable, and Capture One—all relying on reverse-engineered decoding rather than an official SDK. DAM archivists should confirm which converter version matches a given camera model, since newer Lumix bodies sometimes outpace third-party support.

Because no published specification exists, long-term RW2 readability depends entirely on Adobe and open-source maintainers continuing to reverse-engineer each new Panasonic sensor and compression variant. If that maintenance lapses—for a discontinued library or an unsupported camera model—archived RW2 masters could become unreadable years later. This is why DAM workflows commonly convert RW2 to DNG for preservation, keeping the original file only when Panasonic-specific reprocessing is genuinely required.

RawTherapee and darktable decode RW2 through the LibRaw and RawSpeed libraries, which bundle years of accumulated reverse-engineering knowledge about Panasonic's tag layout and compression schemes. LibRaw, built on dcraw's codebase, has recognized RW2 since around October 2009. However, newer Panasonic encoding variants can outpace this support—RawTherapee's custom dcraw fork sometimes extracts the compressed raw stream but fails to fully decode its internal structure for newer camera models.