QTR-Quadtone RIP

Igor

Clearly one can create 2880 dpi curves for the 2200 because there are some
included in the latest distribution for PC (under the Quad2200-NK7 printing
model). However, when I checked, although the curves were there (.quad
files) the original "source code" for the curves were not (the .qidf files).
I suspect the 2880 curves were created by Inkjet Mall, who did not want to
aid competitors by releasing the .qidf files. Unfortunate, because looking
at other's .qidf files is an excellent way of understanding how curves work.
You could ask on this list or on the BW printing list if any has 2880 curves
for the ink/paper you intend to use.

Unfortunately I haven't made one, although I've made a number of 1440
curves.

I'm not clear what the problem was that you encountered - you said that
after 70% black the L value went up (i.e. density decreased). Perhaps 70% is
a reasonable overall ink limit at 2880 dpi.

You can use curves designed for 1440 at 2880 dpi by reducing the shadows by
about -45% in QTR when you print. I haven't checked the linearity of this
approach, though.

HTH

Tom Moore


> -----Original Message-----
> From: QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com] On
> Behalf Of isvibilsky
> Sent: Monday, October 03, 2005 12:15 PM
> To: QuadtoneRIP@yahoogroups.com
> Subject: [QuadtoneRIP] What is the proper way to use 2880 dpi?
> 
> Hi,
> 
> I found that my 2200 printer lays out too much black when I use 2880
> dpi resolution. Not sure this is only my printer or it is known fact.
> When I printed the ink separation page I was surprised to see the
> measured with eye-one values. After 70% black the L value started to
> go up. I was not able to build a curve and linearize it in that mode.
> However, everything works ok when I use 1440 dpi. Is there a way to
> use 2880 dpi?
> 
> Thank you.
> Igor
> www.photographyforever.com