Re: ink restrictions and profile tweaks
Re: ink restrictions and profile tweaks
- Subject: Re: ink restrictions and profile tweaks
- From: Joachim Euler <email@hidden>
- Date: Mon, 11 Jun 2001 10:23:15 +0000
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I am finding that once I have my profile built and do some testing, the
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results I'm getting are somewhat desaturated. For instance, the other
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day a client had some files that used solid fills, bright greens and
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blues.
<snip>
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I'm using Onyx 5.0 for my large format inkjet prints and some of the
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tools I have for tweaking are >NFactor< and >Scale< both affecting the
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linearization. NFactor I don't think is what should tweak, for if I
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understand this item correctly it will only affect the Lin. curve from
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the mid point on down to the highlights. Scale will apply a move on the
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entire curve, but again the affect is on the linearization.
From what I understand your prints only become "desaturated" when printing
with your ICC-profile applied. I assume you apply the profiles from within
PosterShop (which, BTW, uses Logo CMM since version 5.0).
Applying a good "destination" profile of your large format printer is only
one of three main factors you have to consider when working in an ICC-based
workflow. The two others are:
1. The profile(s) which describe where your images come from/which color
space you were originally working for. Technically, those profiles are often
the same type of profile as your printer profile but in this case they are
used as "input" profiles.
Make sure you also activate an appropriate CMYK and/or RGB input profile.
For the CMYK side this may be some generic SWOP/Euroscale profile or one of
your printing press, for the RGB side it may be one of the working spaces
from Photoshop or your scanner profile.
2. The rendering intent you use. Depending on the size of your large format
printer's gamut "perceptual" or "relative colorimetric" seems to make sense.
For my HP Designjet 5000 I am using relatively colorimetric virtually all
the time; the smaller gamut of my Encad printers often makes me use
perceptual.
Try to figure out what the problem is and let us hear about the results.
Jo Euler
--
Public P3 - Pre Print Professionals GmbH Joachim Euler
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