Digital BW, The Print

Ernst,

I used BOOST_K=90 for the profiles mentioned.  The Eye-One yields dmax  
readings in excess of 2.0 for the glossy papers I've worked with and  
the matte paper dmax values are generally in line with values that have  
been reported by others using the x-rite and other densitometers.  I  
haven't tried paper settings other than "matte" for the matte papers,  
but your point about restricting ink is worth investigating.

Carl
On Friday, November 14, 2003, at 03:52  AM, Ernst Dinkla wrote:

>
> ----- Original Message -----
> From: "Carl Schofield" <scho@...>
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Sent: Thursday, November 13, 2003 5:37 PM
> Subject: Re: [Digital BW] QTR Ultratone Dmax on PhotoRag ?
>
>
>> 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
>
> Carl,
>
> Did you use the "grey boost" or whatever it is called in QTR that
> brings in a peak of dark grey ink into the Black at 100% ?
>
> I'm using the Wasatch SoftRip free from any default paper setting
> for this quad printing. For QTR the recommendation is to use the
> matte paper setting of Gimp-print. I wonder whether that
> restricts the ink amount already. That shouldn't be necessary as
> the quad (Hexa) ink use is very different from the way CcMmYK
> printing is done.
>
> With Robert Morrison I am quite sceptic now of spectrometer
> readings of the darkest samples in greywedges. He has written
> some messages on the subject in March. But I also think that
> densitometers have to be checked for matte and gloss readings. It
> will depend on the angle of light in the measure head and
> possibly in the use on polarisation filters in the measure head.
> Similar problems are known in measuring textile colours and with
> the "velvet" matte results we get that analogy isn't so far
> fetched. In general I think the blacks we get are higher in Dmax
> than the spectrometers tell us but not as high as some
> densitometers tell us. A friend has an Eye One where I can
> compare my samples.
>
> Ernst
>
>
>
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