Matt Grum wrote: tsdevine wrote:
It is making me consider converting the uncompressed ARW to a lossless compressed DNG....
Fred Miranda wrote:
That will probably be a good workflow for our new uncompressed RAW files in order to save space. DNG is a better format anyways.
Compression aside, I\'m not convinced DNG it\'s a better format at all - you lose any manufacturer specific metadata, and I simply don\'t buy the idea that it\'s a safer format for archival because it is \"open\" - the source code for DCRAW contains a complete description of how to interpret Sony ARW files, so they are effectively just as open as DNGs.
I would store the original RAWs on a compressed drive, or zip them and store JPEG previews alongside.
DavidBM wrote:
You can\'t see RAW file; you can only see a rendering of it, and channel clipping or out of gamut info and other things in between the RAW file and the screen or print make the image posterized..
You can open up each channel as a greyscale image and examine them as if they are images, that\'s how I would go about looking for posterisation in a RAW file.
sebboh wrote:
is there evidence that sony does cooked in noise reduction to the blue channel from the raw files?
I haven\'t seen any - it would be very easy to detect this by looking at a Fourier transform.
Sep 17, 2015 at 07:08 AM
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