Re: densitometro

[etienne garbaux <photographeur@nerdshack.com>]

Juan Miguel wrote:

> As each paper he/she does have a different color, are not all white 
> pure, should I put to "or" my densitometro on the target of each 
> paper to show him which the density of the pure target is?.
> Otherwise, the densitometro includes a calibration scale, black 
> pure, half pure and gray target. It should gauge the densitometro to 
> these parameters with independence of the color of each paper.
General practice (and my preference) is to calibrate the densitometer 
using the calibration scale.  Then, to determine the Density Range of 
a print, you will measure the density of the paper (in an unexposed 
area, after processing) and subtract that density from the measured 
image density to determine the image density above "paper white" 
(which, as you say, will not be pure white).

Best regards,

etienne