by Ian Burley
Interim solution for Lumix G1 RAW DNG with ACR 5.2
Adobe has released Adobe Camera RAW 5.2, which can now read and process Panasonic Lumix G1 RAW files. A similar upgrade to the RAW compatibility of Adobe Photoshop Lightroom is expected soon as well.
ACR 5.2 is only compatible with Photoshop CS4. or Photoshop Elements versions 6 or 7. If you use an earlier release of Photoshop or another software package that is compatible with DNG RAW file format, you can download the latest Adobe DNG Converter to produce standard RAW files from G1 RAW files. There is a key Adobe update page with notes and advice concerning the latest versions of Adobe Camera RAW.
There is a note concerning the conversion of Panasonic Lumix G1 RAW files to DNG format, Adobe's RAW file format that is an open standard enabling other software applications, including earlier versions of Adobe's own applications, work with RAW files sourced from a wide range of cameras, old and new. Basically, for the time being, such DNG files will be larger than usual. Here is Adobe's explanation:
With the release of Camera Raw 5.2 (and upcoming release of Adobe Photoshop LightroomŪ 2.2), there is an important exception in DNG file handling for the Panasonic DMC-LX3, Panasonic DMC-FX150, Panasonic DMC-FZ28, Panasonic DMC-G1, and Leica D-LUX 4. For those who choose to convert these native, proprietary files to the DNG file format, a linear DNG format is the only conversion option available at this time. A linear DNG file has gone through a demosaic process that converts a single mosaic layer of red, green, and blue channel information into three distinct layers, one for each channel. The resulting linear DNG file is approximately three times the size of a mosaic DNG file or the original proprietary file format.
This exception is a temporary solution to help ensure that Panasonic's and Leica's intended image rendering from their proprietary raw file format is applied to an image when converted DNG files are viewed in third-party software titles. The same image-rendering process is applied automatically in Camera Raw 5.2 and in Photoshop Lightroom 2.2 when viewing the original proprietary raw file format.
In a future release, Adobe plans to update the DNG specification to include an option to embed metadata-based representations of the lens compensations in the DNG file, allowing a mosaic DNG conversion. In the interim, Adobe recommends only converting these files to DNG to allow compatibility with third-party raw converters, previous versions of the Camera Raw plug-in, or previous versions of Photoshop Lightroom.