Digital BW, The Print

Just catching up with this.  What patch were you measuring?  Any significant
variance across the greyscale?  (Given the use of colour ink in the Adv B&W
strips will change with each patch...)


> From: Paul Roark <paul.roark@...>
> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Date: Sat, 24 Dec 2005 13:46:50 -0800
> To: DigitalB&WPrint <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: [Digital BW] Fade Test: 4800 ABW v. UT7
> 
> This fade test had several interesting parts and results.  The ones reported
> here relate to Epson 4800 ABW test strips v. MIS UT7 on EEM and Premier Art
> 205.  (I'll also report some interesting results relating to MIS 2400 inks
> later.  The running time for the next report is different than this one, so
> I'm segregating the results.)
> 
>  
> 
> This part of the test ran for a total time being about equal to 20 Wilhelm
> years.  Non-filtered fluorescent light was used, as usual for me.
> 
>  
> 
> All readings are in Lab.
> 
>  
> 
> I'm not certain how much the paper tone changes affect the image, but it is
> likely the EEM yellowing has a significant impact on the tone (hue) changes
> of the tests.  The changes in the paper readings (test strip minus control)
> are as follows:
> 
>  
> 
> EEM change: 0.05, 2.03, 5.72  (EEM has obviously become much warmer with the
> light, with yellowing being the most significant change.)
> 
>  
> 
> Premier Art change: 0.17, -0.02, -0.48  (This non-OBA paper became slightly
> cooler.)
> 
>  
> 
>  
> 
> Epson Enhanced Matte test strips:
> 
>  
> 
> 4800, EEM control:  53.74, 0.66, 0.57
> 
> 4800, EEN test:       55.07, 0.31, 2.35
> 
>  
> 
> 4800, EEM change: 1.33, -0.35, 1.78
> 
>  
> 
>  
> 
> UT7, EEM control:  54.15, 2.0, -0.14
> 
> UT7, EEM test:      54.38, 1.05, 2.43
> 
>  
> 
> UT7, EEM change   0.23, -.95, 2.57
> 
>  
> 
>  
> 
> Premier Art Fine Art Hot Press 205 test strips:
> 
>  
> 
> 4800, PA control:  54.78, 0.21, 1.77
> 
> 4800, PA test:      55.93, 0.33, 1.25
> 
>  
> 
> 4800, PA change: 1.15, 0.12, -0.52
> 
>  
> 
>  
> 
> UT7, PA control:  59.87, 1.25, 0.63
> 
> UT7, PA test:      60.32, 1.12, 0.70
> 
>  
> 
> UT7, PA change:  0.45, -0.13, 0.07
> 
>  
> 
>  
> 
> Looking just at the fade in density (the first of the Lab change numbers),
> UT7 did much better than the k3 inks.  On EEM the difference was over 5
> times.  On Premier Art (which I believe to have essentially the same coating
> as Epson UltraSmooth) the UT7 still faded less than half as much as the k3
> "Advanced B&W" mode prints.  The additional color inks the ABW mode uses
> probably accounts for part of this difference.
> 
>  
> 
> Looking at the changes in the tones or hues of the test strips, however, the
> k3 ABW print did considerably better on EEM, but not on Premier Art.
> 
>  
> 
> One thing that stands out is how different the tone or hue changes are from
> EEM to Premier Art.  Part of the difference is no doubt the yellowing of
> EEM.  However, the differences are probably also a result of the acidity of
> EEM.   The bottom line is that the tones are much more stable on the acid
> free paper, especially for UT7.
> 
>  
> 
> Paul
> 
> www.PaulRoark.com <http://www.paulroark.com/>