Digital BW, The Print

On Tuesday, August 12, 2003, at 05:00  PM, johngeyles wrote:

> I posted this question awhile back ("could an Epson 3200, or
> other high-end flatbed scanner, be used as a densitometer
> for measuring inkjet prints ?") and people suggested two
> problems: being able to read the high densities of the blacks
> in a good inkjet print, and calibration.
>
> I'd like to respectfully re-visit this problem.  A recent post
> suggested that $28 would get me a calibrated reflective 21-step
> wedge target (from www.stouffer.net).   By scanning this target,
> using a fixed exposure in Vuescan that fills the digital dynamic
> range with the wedge values, I should easily be able to build a
> table of digital value versus density, using the raw file produced
> by Vuescan (probably Gaussian blurred first so I get an averaged
> value).   Then I simply scan my inkjet print with the same exposure
> value and compare the measured digital values against a table
> (obviously some automated interpolation from the table values
> would be handy).
>
> The other issue is, of course, can the 3200 discern the deep
> blacks that hopefully will be present in the inkjet print ?
> Well, supposedly its Dmax is over 3, and the wedges only go up
> to 2.05.  And many here have claimed that print densities
> over 2 are not discernable anyhow.  SO it seems to me that the
> 3200 SHOULD be able to measure all the wedge densities with some
> precision.
>
> Does this make any sense ?  Oh well, I guess I can find out for
> myself for $28 ...
>
> Thanks, John
>
>
>
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