Digital BW, The Print

The figures below were pre Linearization.


From: Steve Kale <stevekale@btinternet.com>
Reply-To: DigitalBlackandWhiteThePrint@yahoogroups.com
Date: Wed, 14 Jul 2004 21:37:18 +0100
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Subject: Re: [Digital BW] QTR, Eboni, MIS UCs and Epson Semi-Gloss - Some
Observations

If anyone is interested (I am not sure how many people out there are using
an MIS CFS-2200-UC) I now have cool and warm curves for use on Epson
Semi-gloss in conjunction with Lyson Print Guard and Renaissance Wax.
Contact me off list if you want them.

The combination of Eboni (bound in with the UCs) and Print Guard and
Renaissance Wax is quite amazing.  Here are the pre and post spray/wax L
values for my cool and warm curves.  Notice the massive shift in the 90-100
range, particularly the 100 step.  For this reason I altered the curves from
the initial ones I had done to reduce the use of Eboni overall, instead
using QTR¹s boost function to punch it in to the upper range (and a higher
overlap of LK/LC/LM).

Cool

85  17.2    17.2
90  12.8    12.9
95  10.7    9.3
100 17.5    7.7

Warm

80  27.9    27.5
85  23.3    22.0
90  19.5    16.6
95  16.8    10.9   
100 20.1    7.6

The wax is a massive influence here.  If I recall correctly the L value for
the 100 step in the warm curve immediately spraying but pre wax was 15.4.
The wax also has the advantage of improving the look of the sprayed image.
It seems to even out the bumps so to speak.  It also has a huge affect on
the look of the 100 step ie on Eboni.  Unsprayed the high Eboni patches look
dull.  Spraying improves this somewhat but the real kicker comes with the
wax.  After that the 100 patch is a strong black with a look similar (in
reflectance I guess) its neighbours.   I have been applying the wax
immediately after spraying with a quick blast of the hair dryer in between.
After the spray and wax combo readings of the 21 steps are stable.






[Non-text portions of this message have been removed]