hi,
Scratching my head on this one.
I have some DNG RAW files and i'm using dng_validate to explore in more detail.
I'm looking at all the stages of processing via outputting uncompressed tifs.
What i would really like to understand is the nature of the source data. When i open the file in After Effects i can see that in the 16 bit tiff file, there are only values shown from 0 to 2048. These files are supposed to be 12 bit so i would have expected up to 4096 (i have some clipping in the file to max the value).
After linearisation these files occupy the full 16 bit but they appear to be scaled with adjustments to the black and white point, that's fine. In other words if i take the pre linear file and use the levels i can pretty much get the same effect of linearisation.
What i would love to know is whether the dng_validate is outputting the exact data in the source files or whether the RAW DNGs could be floating point and the dng_validate when outputting the pre linearsation file is missing some data?
So how close am i to the actual data in the RAW files, are DNGs stored as integer data?
Really appreciate any help!
cheers
Paul