Digital BW, The Print

> Austin,
>
> Are you sure this statement is correct? From everything I've
> read, a normal
> digital camera has sensor cells that measure luminosity and one
> colour, and
> are arranged in various arrays in the proportion of one red
> sensor, one blue
> sensor, and two green sensors. Each sensor output gives rise to one pixel,
> the missing color values for each pixel being interpolated from the
> neighbouring sensors.

Hi Bob,

Yes, that is more or less what I said...but each sensor does NOT give you
one pixel, it gives you one of the three colors of a pixel.  Remember, color
pixels require THREE colors...and since each sensor cell can only give you
one of the three colors...

> So if the camera has 4 M sensors, it will at the very least produce 4M
> pixels

Not from the sensor...the sensor gives you 2M green sensor data, 1M blue
sensor data and 1M red sensor data...

> (all of them interpolated of course, since none of them has all the
> color values).

So the CAMERA gives you 4M of interpolated pixels...not the sensor.

Regards,

Austin


>
> ----- Original Message -----
> From: "Austin Franklin" <darkroom@...>
> >
> > You are also confused by pixels vs sensors.  Digital imaging sensors use
> > FOUR sensor cells to make ONE color pixel...so if you want to
> get the same
> > amount of color information, you need four times the amount of sensors!
> So,
> > 4 x 22.1 is reasonably close to my claim of 100M pixels.
>