PanoTools:
Re: {HTML} Real benefits to using 16bit images?
JD Smith 2004-Nov-08 00:05:14
On Sun, 2004-11-07 at 14:23, joelbierling wrote:
> I'm processing a few hundred images that make up panos using
> ptstitcher and enblend. My source images are Nikon D70 RAWs which I
> understand is a "lossless" (lossy depending on who you talk to)
> compressed 12bit format.
I think the D70 Raw format is lossy in the sense that it doesn't
linearly sample the 12bit A/D output, but instead uses a mapping curve
to cram the 12bit output of the sensor into 9.4bits, to save space, and
enable high frame-rate RAW performance. See:
http://www.majid.info/mylos/weblog/2004/05/02-1.html
So you'd probably notice a smaller difference if you use dcraw (or
whatever) to decode the NEF raw files into 16bit TIFFs vs. 8bit, than
doing this with other cameras' RAW images.
JD
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