Digital BW, The Print

Paul,

I see similar low paper white "a" values with two spectros.
Both read just above 0. But I see "b" values about 0.8 (310g), lower than
Ernst.

I wish there was some way to recalibrate these spectros without sending them
off to Xrite.
You should be able to just buy /install a new white tile and some software
should do the re-calibration for you.
Or are these white tiles really expensive and its cheaper to recalibrate the
exisiting one ?

Mike

On 24 February 2010 01:39, pr_roark <roark.paul@...> wrote:

>
>
> Ernst Dinkla <edinkla@...> wrote:
> >
> > ...
>
> >
> > Straight but inclining, high end to the right, so warmer.
> >
> > Measured the 310gsm on a black tablet with the Spectrocam:
> >
> > Lab 96.03 0.16 1.63
> >
> > the 210gsm
> >
> > Lab 95.87 0.02 0.80
>
> I'm not sure how accurate my spectro is in the very neutral area, but those
> Lab A values look lower than most, but it might be my spectro that is
> reading high. In general, among the papers I use, I tend to like a somewhat
> relatively elevated Lab A.
>
> > ...
>
> > http://www.pigment-print.com/spectrumplot/index.php
>
> There are some interesting dips on some of those graphs. It makes me wonder
> what is in the paper or coating that is absorbing light in a narrow band.
> Interesting stuff, but a bit hard to relate to on first exposure.
>
> Paul
> www.PaulRoark.com <http://www.paulroark.com/>
>
>  
>


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