: 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.
Chip Stratton
cstrat@xxxxxxxxx
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