Digital BW, The Print

On 03/01/2012 05:56 PM, Paul wrote:


> I looked at some Aardenburg-Imaging
> <http://www.aardenburg-imaging.com/acceleratedagingtests.html> results
> and tried to compare the Epson Gloss Optimizer (R800/1800) results with
> the UltraChrome results on the same glossy papers (Premium Glossy and
> Luster). I can't tell from the materials whether the Epson GO was turned
> on or off in those tests; I have assumed the GO is being used. The Epson
> GO uses a lot (25 - 30%) of glycerol. (See
> http://www.epson.com/cgi-bin/Store/support/supDetail.jsp?BV_UseBVCookie=yes&oid=30501&infoType=MSDS
> <http://www.epson.com/cgi-bin/Store/support/supDetail.jsp?BV_UseBVCookie=yes&oid=30501&infoType=MSDS>).
> The R800/1800 overall has better fade numbers than the UC printers. But
> that could have been due to no light pigments or the additional ones
> they use (although the yellows are probably the same and it does better
> there too). With respect to the paper white, in the tests where Premium
> Glossy is used, the UC printer had a very slight advantage. With the
> Luster, the R800/1800 had the advantage. (But there it was roll paper v.
> sheet, so there could have been a relevant variable there.) At any rate,
> I'd say, assuming the GO was being used, there was not serious detriment
> to the inks from the GO and its high glycerol content.


I asked Mark in the dpreview forum whether the paper white was measured 
including gloss enhancer when avialable in the inkset. He was positive 
on that. If in the inkset and  gloss paper used the paper white is 
measured with the gloss enhancer applied.
In that case tests with Epson R800, R1800, Z3100, Z3200 printers and 
third party inks for mentioned printers should be checked.

I went along the Epson Premium Luster tests with said printers and I see 
a slight negative change on the paper white shifts if compared to 
printers without a gloss enhancer (Epson 4800, Epson 2200), at 30 
Megalux Hours they all are at 100 but at 60 MH the change sets in. Of 
two tests that went to 240 MH, the Epson 4800 bare paper white was at 
71,1 and the R1800 with GE at 51,6.

The same done for Ilford Gold Fibre Silk, less tests there done above 80 
MH but gloss enhancer samples at 80 MH show more paper white shift than 
bare paper samples show. The Z3100 test goes up to 180 MH and shows more 
shift 83,9 than a bare 200 MH IGFS test showed with 87,1. At 160 MH 
there is even a dip to 77,7 which I attribute to a false measurement as 
it went up again after that period.

Not too many samples tested with GE applied but I do not see one that 
goes in the other direction.

The contrast with samples sprayed with a protective varnish is even more 
pronounced so we should forget that a gloss enhancer has a similar 
quality, it is rather the opposite.


-- 
Met vriendelijke groeten,   Ernst

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