Digital BW, The Print

My thanks again Greg,

 I asked because I did see what I believe to be from media
differences. The instrument I spoke of has a light tight seal to the
sample surface though of course it doesn't stop light from leaking in
via  the coating or paper itself for the base readings or near.
Particularly for gloss surfaces. It isn't a major issue, as you
mention, except for daylight or something with high uv that impacts
OBA papers. In that case the external light seems to have considerable
impact. Part of this is due to the instrument design as it uses dark
cycle, light cycle comparative measures and is adversely affected by
flourescence during the dark measurement if it is present as well as
contributing to inaccurate readings at very high density values.
 Neither problem was insurmountable, in bright room conditions I just
needed to "bag" it so to speak :-).

Regards
Duane


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Greg"
<dfaprinting@...> wrote:
>
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "dlruckus" 
> <dlruckus@> wrote:
> >
> >  tell me if they can see any variances of measurements taken with
> > changes in the ambiant working area light.
> > 
> 
> 
> On some media... Absolutely. Especially with the Pulse since it rides 
> about 5mm about the paper. But the same goes for the i1 and DTP22. 
> Consider that the DTP 22 has a foot the nearly seals against both the 
> paper and the spectro. Normal room illumination doesn't really cause 
> too much of a problem, but when daylight comes in from a window, your 
> measurements WILL be different. I haven't noticed a difference from 
> media, so I'm not sure if that has as much effect as the ambient 
> light getting in around the edges of the spectro.
>