Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Ernst Dinkla
<E.Dinkla@c...> wrote:

> zonepeter wrote:
 
> >My densitometer arrived today without calibration plaques. 


 
 
> The IT8 ones are color paper and they fade in hue and density,
average 
> numbers from the web are a risk too, an IT8 target should have a
batch 
> measurement table somewhere, check the number and date on the target
and 
> do a search. If it isn't too old you will find the numbers
somewhere, if 
> not consider the target as being too old.

...aside from the possibility of fading,a paper target's accuracy will
deteriorate due to handling and normal use, including the necessary
direct contact that's made with the densitometer--so  such a standard
is not likely to be relaible for long-term use (i.e., used for
frequent recalibration). If the densitometer was advertised as "with
plaque" but did not include it, I'd certainly complain to the seller
and demand some compensation.

Phil