ink restrictions and profile tweaks
ink restrictions and profile tweaks
- Subject: ink restrictions and profile tweaks
- From: David Wollmann <email@hidden>
- Date: Wed, 06 Jun 2001 14:38:23 -0600
- Organization: Luna Vista Imaging
Hi all,
I'm looking for some tips to help improve profiles for inkjet printers
when using media that requires a fair amount of ink restriction.
I am profiling media such as scrim banner vinyl and another type of
vinyl that has an adhesive back. I'm using pigmented ink because the
intended use is outdoors.
With the pigmented inks and vinyl media there is a fair amount of ink
restriction applied before making my linearization table. This of coarse
is necessary to avoid bleeding.
I am finding that once I have my profile built and do some testing, the
results I'm getting are somewhat desaturated. For instance, the other
day a client had some files that used solid fills, bright greens and
blues.
I know I won't be able to hit these colors exactly but what I am seeing
is that the green has a high amount of magenta in it and if I do a
localized color correction in my RIP I can then simulate the brightness
and hue much closer.
To me it seems that the profile and/or the software RIP applying this
profile, is attempting to match density (?) rather than hue - at least
when the gamut is compressed as much as it is with these high ink
restrictions - thus I'm seeing the contaminant color, i.e. magenta in
green, too high.
Also, an orangish color needed to have some cyan removed for a more
pleasing match and a bright yellow needed magenta and cyan removed.
I'm using Onyx 5.0 for my large format inkjet prints and some of the
tools I have for tweaking are >NFactor< and >Scale< both affecting the
linearization. NFactor I don't think is what should tweak, for if I
understand this item correctly it will only affect the Lin. curve from
the mid point on down to the highlights. Scale will apply a move on the
entire curve, but again the affect is on the linearization.
My overall balance as far as grays is fine, so I don't think I would
want to edit anything with NFactor or Scale as this would throw off
linearization.
I can tweak the Profile itself with the follow adjustments; contrast,
brightness, saturation, and then I could also pull curve moves
separately on CMYK.
So, it would seem that adjusting the saturation might be the way to go.
Does anyone else have any thoughts or tips or tricks they can share?
Thanks,
David Wollmann
President
Luna Vista Imaging