Digital BW, The Print

Dmax is visual density and it is a property specifically of the inks laid
down when you print 100% black (and of course the whiteness of the paper).
The numbers that I mentioned were properly read using a densitometer which
is the correct instrument for measuring dmax.  Most spectrophotometers will
also give you visual...which is approximately dmax.

Robert

On 10/11/02 3:39 PM, "mfp90021" <mfp90021@...> wrote:

> 
>>> I also find the Dmax to be much better than the Gen 4 inks.
>> 
>> I couldn't tell from your email whether you were using
> Photorag...as the
>> subject line suggests, or EAM.  It is certainly not true that the
> dmax of
>> the Ultrachromes beats Gen4 on photorag...its not even close
> from the
>> numbers that I've seen.  The two ink sets are close on EAM,
> however.  But
>> the main issue is that the Ultrachrome Matte black seems to
> be much more
>> stable.
>> 
>> Robert
> 
> I'm not sure where those numbers came from.
> 
> You  prompted me to take some readings using a Spectrolino in
> spot color mode.  Here are the RGB values (lower value = better
> Dmax).  All Ultrachrome values with matte black ink.
>                                                          R  G  B
> Ilford RC PHOTO paper..................21 20 22
> Ultrachrome/PhotoRag...................34 34 34
> Piezotone/ PhotoRag.......................29 30 34
> Sundance/Sommerset E.................45 45 44
> Ultrachrome/EAM..............................30 31 31
> Gen4/EAM......................................32 33 37
> Gen4/BrightcubeSatine....................38 41 43
> UltraChrome/BrightCubeSatine.... 35 36 37
> 
> I'm sorry that I don't have a value for Gen4/PR but I gave the 1200
> printer to my neighbor.  I'll try to get that ASAP.
> 
> The black of the Epson 2200, using Photo Rag and the matte
> black ink, is very rich.
> 
> www.michaelfaye.com
> 
> 
> 
> 
> 
> 
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