From: Sandy King (sanking@hubcap.clemson.edu)
Date: 11/17/00-09:56:35 PM Z
Joe,
When one reads a stained negative with a color densitometer the
silver density is read without a filter, the silver plus stain
density is read with the blue channel. For most alternative processes
the reading that counts most is that which measures total density,
i.e. silver plus stain. This will be the higher reading. The
difference between the two readings will vary depending on the total
density range of the negative but for negatives with a DR of about
1.6 the difference will approach or exceed log 0.4.
Sandy King
>After a fairly long absence, I'm heading back into the darkroom. I am
>planning on looking into several incarnations of pyro developers as a
>personal experiment. One thing has always confused me, yes one could say
>that from time to time I maybe a little thick. When one reads a stained
>pyro neg, we use the blue channel to read the density of silver only. We
>can read the silver density and stain with no filter. When determining the
>density range of the negative, in this case, for an alt process which
>reading should one use, the silver density only or the total density
>including the stain?
>
> Thanks,
>
> Joe Portale
>Bumbling along in Tucson.
>
This archive was generated by hypermail 2b30 : 12/01/00-11:46:57 AM Z CST