CRW File Format [Archive] - Canon Digital Photography Forums

bradb123

18th of November 2003 (Tue), 13:37

Is there any documentation on how to extract the RAW data in the CRW. If not does anybody know how the format is for the RAW ie. RGB or RRRRGGGGBBBB and what about the pixel size. Does it store it as 8,12 or 16 bits. Thanks

toddb

18th of November 2003 (Tue), 15:00

I know one part of the answer, I'm pretty sure it's 12bit.

sjprg

18th of November 2003 (Tue), 16:47

More than most people would care to know. Plus an open source raw converter.

http://www.cybercom.net/~dcoffin/

Paul

CyberDyneSystems

18th of November 2003 (Tue), 17:31

That link is awesome!

Guillermo Freige

19th of November 2003 (Wed), 01:28

In fact RAW data are only 12-bit, because only intensity levels (without any color information) is stored. Color information is generated because there is a array of color filters in a Bayer pattern using the RGBG distribution over the sensor. RAW converters know that fact, so they reconstruct color information asigning to every pixel the corresponding color of the pattern and interpolating the other two using adjacent pixels. So after interpolation the resulting image is a RGB 36-bit image (in a linear gamma), and it can be stored as a 48bit (16 bit per channel) nonlinear image without degradation.