Digital BW, The Print

On 04/18/2012 04:48 PM, Paul wrote:


> Most of the CFs here now carry an "energy star" label which requires a
> CRI of 80 or higher. See
> http://www.energystar.gov/index.cfm?c=fixture_guide.pr_fixtures_guide_lightquality
> . The problem fluorescent lights I ran into with the gallery are older
> style, with a 75 CRI. So the extent of the problem I ran into may be
> much less applicable to most people.

CRI numbers are like Lab values for paper white, they tell very little 
about the spectral distribution and flatter manufacturer's specifications.


>  > You did not mention the paper you used. OBAs remain an issue ...
>
> I tried a number of papers. The lower the OBA amount, the less the
> problem but even on Museo the dyes shifted colors too badly.

No OBA in them as far as I measured their catalogue.


> A combination of government energy efficiency regulations and economics
> is forcing the issue here. I think "hot wire" technology is out of the
> question. The current LEDs appear to be better than the CFs already. We
> will just have to watch our profiling to be sure we don't end up with
> reddish prints.

As written the Quantum Dot LEDs promises all we would like to see.
There is also the yellowing issue, I guess cataract removal will be 
needed for all the veterans here to enjoy that light even more and no 
need for any OBA papers after that :-)



-- 
Met vriendelijke groet, Ernst

Dinkla Grafische Techniek
Quad, pi\ufffdzografie, gicl\ufffde
www.pigment-print.com