Re: DTP41UV/T or DTP41/T - which to choose??
Re: DTP41UV/T or DTP41/T - which to choose??
- Subject: Re: DTP41UV/T or DTP41/T - which to choose??
- From: Henrik Holmegaard <email@hidden>
- Date: Fri, 11 Oct 2002 08:11:14 +0200
Marcelo Copetti <email@hidden> wrote:
>At first, if you have or will have papers with whiteners, you need an
>UV filter.
Whether a UV cut filter is needed would depend on the print profiling
software.
>In case of papers (or other materials) with whiteners, invisible light
>is converted to visible light, and spectrophometers read as blue, and
>software usually try to avoid this problem with more yellow, than you
>have a profile that produces a bad proof.
The rub is that optical brightener may be found in either the printing
paper or the proofing paper (or in both, of course). So the effect seen
in the proof may be true or untrue, depending on where in the profile
chain the optical brightener occurs. There's a line or two in the i1
proof-printing cookbook.
If the offset paper being simulated has optical brightener, then the
proof should show that this is the case.
If the offset paper being simulated does not have optical brightener
and the inkjet paper on which the simulation is printed does have
brightener, then the effect of the optical brightener in the inkjet
paper should be dealt with.
One could link this to a rule of thumb: The idea is that one should
only adapt profiles for in-house color devices over which one has
control, and not adapt profiles for outsourced devices over which
others have control (since the way the profile for the outsourced
device works is likely intentional). This rule of thumb came from Fred
Bunting, if I remember right.
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