Digital BW, The Print

Hi Anthony,

> > Typically, this data is downloaded to an internal
> > LUT (Look Up Table), where the data coming in is
> > the address, and the data going out is the adjusted
> > data.
>
> But that is downstream of the ADC, right?

Correct.

> Nobody is adjusting
> the linearity
> of the analog side of the scanner, I assume (?).

Well, for the most part, correct.  There may be something being done, but
that is scanner dependant, and I'd say I know of nothing...but I can't make
a general statement that it never happens...

> Not even sure
> if that can
> be adjusted for CCDs (which tend to be linear, whether you want them that
> way or not).

Actually, yes you can, but it's easier to do in digital, as the
non-linearity is on a sensor basis, not just signal level.  In digicams it's
called PRNU, Photo Response Non-Uniformity, and is calibrated and then
applied, as a LUT, to the image data for each pixel.

Regards,

Austin