Digital BW, The Print

Ernst,

With the 2200, the Dmax for H Photo Rag was 1.63 - 1.64, using QTR 
beta8  and Epson UC inks (matte black).  EEM gives Dmax 1.68 - 1.70.  
These Dmax readings are from the 100% black patch in the 21 step gray 
wedges used for linearization with the Eye-One spectrophotometer.

Carl Schofield

On Thursday, November 13, 2003, at 06:15  AM, Ernst Dinkla wrote:

>
> ----- Original Message -----
> From: "Paul Roark" <paul.roark@...>
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Sent: Wednesday, November 12, 2003 7:14 PM
> Subject: RE: [Digital BW] QTR Ultratone Dmax on PhotoRag ?
>
>
>>> ... I'm back to the Wasatch SoftRip for quad printing. ...
>>> The Eboni black in all the 4 curves is at least 1.85
>>> on PhotoRag, ...
>>
>> Wow, maybe I ought to look into this RIP.  That's a fantastic
> dmax for matte
>> paper.
>
> Well, I'm not so sure anymore about that number and not sure
> about any number anymore.
>
> I didn't trust the densitometer that much so I used the Kodak
> Reflectence Density Guide next to it. Both readings were almost
> identical with the old Gretag D142-3, the 2.00 patch of the Kodak
> and the black printed. Kodak doesn't give a guarantee that it is
> exactly 2.00 D. This morning I measured the same patches with the
> Spectrocam and get much more difference between the two readings.
> The densitometer is very much influenced by the gloss versus
> matte readings, matte readings end up too high, that even shows
> up on two different Kodak reflection guides where one is more
> matte but should be 0.5 lower in density and ends up higher.
> Could be that this meter needs a polariser and then can be
> calibrated correctly. I actually don't trust the Spectrocam
> either when it has to read into 1.8 to 2.0 territory. Stays about
> 0.07 to 0.1 below what it should be. 1.65 to 1.68 D status T are
> the readings.  This also means that the linearisation with the
> Spectrocam into the darkest samples can't be correct. Not that
> much of a problem as it should make the steps wider in that area
> if the Wasatch isn't compensating the SpectroCam readings.
>
> With the Spectrocam a Generations 4 (black ink only) printed with
> the Wasatch RIP is reading slightly higher than the Eboni black
> (cool curve), the Gretag gives a much higher reading for the
> Eboni black sample made with the cool curve. Both matte samples
> on the same paper. To the eye the blacks are indentical in
> density but Generations a tiny bit cooler. Outdoors, tungsten
> halogeen and 5500 K light. Jerry Olson was right to use
> Generations at that time, did he use the PressReady RIP then to
> get beyond the Epson driver black ink limit ?
>
> The only thing I trust now is my eye looking through the Kodak
> guide punches on the sample and shifting the light falling on the
> samples from reflection to diffuse. The black is near 1.8 D.
>
> The subject had a question mark and I'm still wondering what QTR
> should deliver in Dmax to get some reference. Especially the
> "grey boost" to the black should give something similar in
> density or even better.
>
> Ernst