RW2

RW2 is a proprietary RAW image file format used by Panasonic Lumix digital cameras. The file extension is .rw2, and the format is designed to store the camera’s unprocessed sensor data along with descriptive metadata such as exposure, white balance, ISO, focal length, and lens information. As a RAW format, RW2 is intended for post-processing, providing greater latitude for adjustments than finished JPEGs.

Origin and usage: RW2 was introduced as Panasonic’s RAW workflow format for Lumix cameras, including many Micro Four Thirds and some other body lines. Different camera models may offer varying RAW options, including uncompressed or lossless compressed RW2, depending on the specific device and firmware. The format is primarily used by photographers who want to preserve maximum image data for later processing.

Compatibility and software: RW2 is a proprietary format, but it is widely supported by modern RAW processors. Software such as Adobe Photoshop and Lightroom, Darktable, RawTherapee, and other image editors can read RW2, often via libraries like LibRaw. Some operating systems or viewers may require additional codecs or software updates to display RW2 previews. For cross-platform interoperability, photographers often convert RW2 files to more universal formats (such as TIFF or DNG) after processing.

Usage considerations: When shooting in RW2, photographers retain the highest-quality image data for editing, at the cost of larger file sizes and the need for compatible software. Backups typically include both RW2 and a deliverable format (JPEG or TIFF). RW2 remains a common choice for users within the Panasonic Lumix ecosystem who value RAW flexibility.