raspiraw

Raspberry Pi CSI camera board JPEG+RAW photo to Adobe DNG converter (rpi2dng).

Changes

Version 2.3

New executable rpi2dng. The old executable raspi_dng is marked as deprecated and will no longer be maintained.

New features of rpi2dng:

• unix-style commandline interface
• processes all files passed on the commandline at once, so ./rpi2dng /some/dir/*.jpg will process all jpgs in that directory at once.
• use ./rpi2dng -h for help
• replaced raspi_dng.sh with rpi2dng.sh and support new features of rpi2dng

Version 2.2

The converter now supports old raw images (model: ov5647) and new raw images (model: RP_OV5647).

Unless a matrix is provided as the third argument, the converter now uses the embedded color matrix automatically.

The wrapper script has changed accordingly. It supports a number of additional options, e.g. direct conversion to tif using dcraw. Run

./raspi_dng.sh -h

for a short help.

Version 2.1

The default matrix is now a sensible but not optimal default.

With this version, you can pass an additional color-matrix to the the converter. The new script raspi_dng.sh will extract the color-matrix from the image and pass it to raspi_dng. This is a quick-and-dirty workaround. When I figured out how to read the relevant EXIF-data from within the C-code the wrapper should no longer be necessary.

Version 2

Due to firmware changes (somewhere around end of May 2013), the readout of the sensor has changed and the Bayer-pattern is no longer correct. This version of raspi_dng works with raw-images taken with current firmware. If you still need to process old images, use the original version of raspi_dng.

N.B.: old images are easily identified: the EXIF-tag 'model' is 'ov5647' for old images and 'RP_OV5647' for new images.

The makefile now supports compilation on the RPI (but see note below) and on 64bit Linux systems.

Prerequisites

C compiler, Internet connection to download the required version of libtiff and a patch. Starting with version 2.2, you also need to install libexif-dev (or however your distribution calls the package).

Build instructions

Just run make, you will need a working Internet connection on the first run.

IMPORTANT NOTE: raspi_dng does not work correctly on the RPI itself, since the color-matrix is not stored correctly in the dng-file (negative values are stored as zeros). This is due to a problem within the tiff-library. So it is recommended to download the image-files to a PC and to convert the files there. Help on this issue is highly welcome.

Usage

• Take a picture on the RPi embedding RAW data:

    raspistill --raw -o out.jpg
  

• Transfer the output file to where you have raspi_dng

• Convert to Adobe DNG (no EXIF yet):

    ./raspi_dng out.jpg out.dng
  

• Copy EXIF metadata from JPEG (date, exposure, lens, metering mode, etc.):

    exiftool -tagsFromFile out.jpg out.dng -o out.exif.dng
  

  Note that this step is not necessary if you use the wrapper-script raspi_dng.sh.

See also

• Raspberry Pi forum topic: http://www.raspberrypi.org/phpBB3/viewtopic.php?t=44918&p=356676
• Sample Raspberry Pi JPEG+RAW images: http://bealecorner.org/best/RPi/
• dcraw homepage: http://www.cybercom.net/~dcoffin/dcraw/