Hi Chip
You're right for CCDs, but they have actually 3x the number of pixels
to measure the colours, so it works out sort-of even.
I suppose, ideally, they should have a little prism (lots of little
prisms) to split the light up for the three pixels. No filters
necessary!
Tom
On 22 Dec 99, at 10:11, Chip Stratton spoke about
*RE: [OM] Digital 35mm replacement..* saying
> : owner-olympus@xxxxxxxxxxxxxxx
> > [ma
> > -----Original Message-----
> > Fromilto:owner-olympus@xxxxxxxxxxxxxxx]On Behalf Of Ian A. Nichols
> > Sen> > No, at least 20 megaPixel (MP)
> >
> > Oops, my figure of 6 megapixels was based on the typical file sizes I
> > get from scanning 35mm at 2700dpi - 18-20 MB/3 (3bytes per pixel). But
> > then, the scans are usually cropped a bit. Doing a bit of maths suggests
> > that the full frame at 2700 dpi would give more like 10 megapixels (can
> > we shorten that to MPx?). I'd be quite happy with that myself, thougH I
> > realise that someone wanting to produce exhibition-size prints would
> > demand more.
>
> Well there is one more fly in the ointment. A scanner can determine the
> exact color for a given pixel because each pixel is scanned in three
> separate color channels.
>
> A digital camera does not have that luxury. The luminance of each pixel can
> be determined by the sensor in it's color channel, but it's actual color has
> to be inferred by surrounding pixels - each pixel having a mask of (I think)
> red, green, or blue. This means a digital photograph of a given size
> actually has less information content than a scan of the same size.
...
And a happy New Year to you and yours.
-----------------
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