Digital BW, The Print

Steve,

There are two opinions on this.

One is to go with the graphic arts standard 5000K color temperature 
illumination that is used in color reproduction and is close to 
daylight. ConeTech has calibrated their working spaces to this 
standard. An Ott light is also closer to daylight as an inexpensive 
solution.

The second is to go with fact that in galleries and museums the 
majority of the light falling on the prints will come from tungsten 
and/or halogen floods. Mixtures of the two seem to be common in 
galleries. This is also what I would expect to find in most home 
displays. It is certainly going to be the case once the sun goes down.

The other issue to take into account is that both ink sets warm over 
time. Some of the warming is related to light exposure and some seems 
to be a result of chemical interactions with paper coatings and/or 
environmental reactions. One of the reason's Paul Roark's neutral 
curve is to the blue side is to act as an offset so when the print 
stabilizes in will be closer to neutral.

With this information, if you do know what the display lighting will 
be you can make a better choice. Other than that we sort of have to 
pick our compromises and wait for the manufacturers to solve the 
metamerism problems. 

Martin


--- In DigitalBlackandWhiteThePrint@y..., sdmey4@a... wrote:
> Oh yes, I have seen the exact same thing and reported it. I believe 
Martins 
> observations are the same. So what are we to do? Which type of 
light is 
> normal display conditions. I hate the MIS tone in daylight, but 
love it in 
> Tungsten lighting. Same with Piezo, but reverse.
> Steve M.
> 
> In a message dated 10/10/2001 9:40:53 PM Pacific Daylight Time, 
> terryr1028@h... writes:
> 
> 
> > One thing I did notice though, in normal tungsten lighting the 
Piezo 
> > print has a slight greenish tone, not a lot but you can detect 
it. 
> > Put it under normal daylight from a window that does not have 
direct 
> > sun coming through it (this will actually show the extreme of 
> > metamerism of any ink better than putting it in direct sunlight), 
and 
> > it is quite neutral, even losing some of the warmth. The MIS VM 
using 
> > the neutral cool curve is just that in normal tungsten lighting, 
but 
> > go to that same window as described above and it warms up and 
picks 
> > up the greenish tone. They actually reverse their appearance from 
> > normal tungsten lighting!
> > 
> > Anyone else see this happen?
> > 
> > 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]