I've been waiting for this to come up again to ask a dumb question. If an istD is 6MP at 12bits per pixel this would be about 9MB of raw sensor data. The .PEF files are a little over 12MB in size. What information is contained in the additional ~3MB? Or is the file simply "padded" to 2 bytes per pixel? This has probably been answered 100 times already but I don't seem to be able to find a simple answer in the archives.
Don > -----Original Message----- > From: Steve Jolly [mailto:[EMAIL PROTECTED] > Sent: Thursday, October 21, 2004 5:13 AM > To: [EMAIL PROTECTED] > Subject: Yet Another Discussion of Bayer Sensor Resolutions (was Re: > MZ-S discontinued?) > > > Toralf Lund wrote: > > I haven't tried doing the actual maths, but I would assume that no > > algorithm can be proven to give you more than 2MPs worth of information > > *in the general case*. On the other hand, you might probably show that > > they can give you more than that (up to 6MP) under certain specific > > conditions. I think the trick to it all is being able to make > > assumptions about the conditions (i.e. luminance phenomena) that hold > > most of the time. > > That sounds reasonable to me - except that as described, you can get 3MP > out of the green channel using just a half-decent interpolation > algorithm. The cases where you *can't* get more than that by using the > other channels are the cases where the brightness of the image varies > significantly between the channels - photos with strong colour casts are > the only obvious example that comes to mind. (Indeed, if photographing > a scene lit only with red or blue light, you'd only get 1.5MP of > information. It's fascinating - analogous to the days of orthochromatic > film. :-) > > S >
