Re: ink restrictions and profile tweaks
Re: ink restrictions and profile tweaks
- Subject: Re: ink restrictions and profile tweaks
- From: David Wollmann <email@hidden>
- Date: Wed, 13 Jun 2001 23:58:07 -0600
- Organization: Luna Vista Imaging
Peter Henry writes,
>
yes I know the desaturated problem with the hp5000
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snip
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the standard media model applied by ps for the linearisation is tweaked from
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the beginning on. it refers to somewhat like swap coated. this makes sense
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for some good reasons but for iccs and the hp it is counter productive
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because the approach is different here.
>
>
Well now this is interesting. I am using ColorSpan printers,
in this instance the 8 head Displaymaker 7100, but I think
your advice still applies.
>
* DRAG THE KNOT OF THE DEPTH OF EACH COLOUR FAR TO THE TOP OF THE GRAPH
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AND
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RELEASE IT!!
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In the tweak linearization window for Onyx Profiler 5.0
there are three tabs; 1) Desired Target 2) Swatch
Measurements and 3) Lin. Table.
So, under the first Tab, Desired Target, I choose the >Knot<
or Anchor Point of the highest position for each color. When
I drag this up and release, this now adds a new target point
for 100%.
>
* you'll see then that the 100% tone will get a higher density nearly to the
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measured one. THIS IS THE KEY POINT
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Yes, the density number is just a bit lower than the actual
measurement for that ink's maximum. Prior to this 95 percent
is the highest target position.
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* now make again the inklimit
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This is to double check that the media still will not bleed
with the new settings, yes? And you do mean the Ink Limit
file and not the Ink Restriction file, Right? The Ink
restriction file is what Onyx provides for use before media
is Linearized to determine if any Ink restriction is even
needed.
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the reason for the desaturation is that the icc swatch in not printed in the
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max depth. the lin of ps5.x is not using them. the new profile assumes then
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that it has to mix other colours into some pur hues. that makes the effect.
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I don't know whether this is a bug. but because of the history of the
>
product it is probably normal.
>
>
This makes sense to me, however, having a position set in
the Lin. target for 100% is contrary to what Onyx states for
version 4.5 and maybe even 5.0. I will certainly experiment
with this new procedure and let you know my results.
I did do a test editing the profile itself, prior to your
post, through Onyx and was not happy with the results. I
tweaked the profile for Saturation first, but surprisingly
this added to the overall density of the problem green, it
raised all CMY numbers.
For the record here are the numbers for this lime green;
As built in Quark - 18c 0m 100y 6k
For Pigment Inks and
Vinyl from my profile - 35c 30m 97y 0k
Client Approved Color
My Local Edit - 27c 5m 100y 0k
Thank you very much for you input, I'll keep you all
informed as to my progress.
David Wollmann