Digital BW, The Print

That's very interesting data, Paul, thanks.

Even the 100/100 warm IP5 profile uses a lot of photo cyan and photo
magenta.  I've tried driving the 2200 with only light black and black, and
while it is very warm the results are completely unsatisfactory because of
the dither in the hilights due to the too dark light black ink.  IP5's
success with the 2200 is attributed to their adding color to smooth out the
hilights.  The key, is that unlike the Epson driver they don't add
yellow...this is the key to the metamerism.  They also do a better job with
the shadows than the epson driver...but it is still not perfect. I could
probably live with the 100/100 warm color in IP5...but I would really like
to be able to get warmer without the dot gain...so I think your UC VM 4.3
quad is absolutely the way to go for a metamerism free valuable tone
solution.  Can't wait to try it with Ink Jet Control...but it also looks
like this new QuadtoneRIP for OSX and Linux might also be yet another
possibility for mac users.

Could you remind us what printers you know have RGB workflows for with the
epson driver?

Robert



On 3/5/03 6:18 PM, "Paul Roark" <paul.roark@...> wrote:

> Hi,
> 
> I received some samples of 2200 IP5 output today (thanks Tom Fors) and was
> curious how they compared to the quads many of us use.
> 
> In general, I think the 2200 output looks very good.  However, the dots in
> the highlights are apparent on some of the prints.  A 1600 dpi scan of the
> print makes it clear that much of this print is still a color print.  I was
> surprised at how much color is still used even at 50%.  Then again, the
> UltraChrome light gray ink is quite warm.  So, even if for no other reason,
> a fair amount of magenta and cyan has to be added to get the print neutral.
> 
> At any rate, looking at the highlight dots, I scanned a number of test
> strips at the 5% patch and used the Photoshop Histogram Standard Deviation
> as a measure of the relative roughness of the print at that point.  I think
> this gives a reasonable measure that correlates with visual appearance.  (I
> have no authoritative citation for this, however.)
> 
> At any rate, here are some measures of 5% patch standard deviations.  The
> lower the number, the smoother the print highlights.  I've also included the
> 50% reading.  All samples are on EEM/EAM.  All were at 1440 as far as I can
> tell.
> 
> Printer/Driver-curve/Ink    5% Std. Dev.    50% Std. Dev.
> 
> 2200/IP5/Neutral tint        5.54            5.03
> 
> 870/neutral/MIS-VMS        2.15            3.56
> 
> 3000/Neutral/VMS            4.80            7.91
> 
> 1280/Neutral/MIS VM        2.56            3.38
> 
> 1280/Piezo/FS-N            3.04            4.34
> 
> 1280/Blk only/PT            7.46            10.2
> 
> 
> Paul
> http://www.PaulRoark.com
> 
> 
> 
> 
> 
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