IanC_UK said:Doing several google searches, all single chip DSLr cameras, use the Bayer filtering method, there are several cameras that have 3 sensors one for each colour. But all DSLR from Canon, Nikon etc user the Bayer Filter method for colour ! If you have a lot of one colour pixels next to each other in a picture the calculations will make the file size smaller, i have several cr2 images from my 20d and not 2 are the same size !
The quality of these images depends on the algorithms used by raw decoding software, and the results from different raw software can be VERY different, using the same raw file.
one of many searches
kamion said:First of all, thanks for your time and help so far. :thumb:
I Googled a *.cr2 file for the EOS 5D. Trying to extract the contents now, though it's still saying it's "lossless JPEG" rather than a "compressed RAW" according to dcraw.c. :confused-
Steve said:I am not sure that you will be able to get information from any cameras RAW file as from my understanding, the data is sent from the sensor through the in camera processor that runs all the manufacturers pre-programmed algorithms to shape the image before being recorded as a RAW file or being processed into a JPG. That is one of the reasons why certain cameras have different characteristics, due to those manufacturer programmed algorithms. I am sure that Canon, Nikon etc will be able to isolate the raw sensor data in a controlled environment such as a test bed in a lab, but I doubt that any of them would supply that output or indeed any information as to their algorithms, it is after all propriety technology. I could be completely wrong though?
kamion said:Ok, but I am not after the algorithms. We have our own algorithms. Just need a source of raw data from a sensor to test validate our algorithms.
Anyway, I'll continue my research and I'll let you all know when I find some answers!
Cheers!
Steve said:I would think that they would be your best bet and would be able to supply RAW data if it suits them.