Re: Optical Brighters while using UV Filter + Linearization and Profiles
Re: Optical Brighters while using UV Filter + Linearization and Profiles
- Subject: Re: Optical Brighters while using UV Filter + Linearization and Profiles
- From: Marc Levine <email@hidden>
- Date: Mon, 19 Jul 2004 01:11:31 -0400
>
I wish I knew what position Monaco will take on this with their next version
>
of MonacoPROFILER (Which is my personal favorite for pre PM5; if ONLY for
>
the reason it will put a device linearization in the profile, applied to the
>
patches for the times you can not linearize (no rip, Color Laser, Color
>
Copy, etc.)
Cedric (and Roger),
MonacoPROFILER 4.7 is scheduled to ship later next month (August).
Changes/Improvements will include:
-core updates to increase quality in all rendering intents
-new display calibration tools (equivalent of MonacoOPTIX Pro)
-new device support (MonacoOPTIX XR, X-Rite DTP70)
-new target support (ECI, IT8/7.3, IT8/7.4)
-improved patch generation for DTP41
-enhanced support for target scrambling (uses ECI "random" for ECI target,
all scramble algorithms completely cross-platform)
Regarding the UV/Non-UV impression, it is still my impression to this day
that competitive packages allow for "Optical Brightener Correction" in the
perceptual intent. I invite anybody who could prove this to the contrary to
chime in. Many people "think" or "expect" that it does, but most of the
consultants I know concur on this being a "perceptual-only" thing. If you
are using RelCol with your profiles and see no difference, it would only
substantiate the case.
In Roger's case of using UV-detection and a Uvcut instrument, the
instrument's filter supposedly would strip the UV component from the light
source and nullify any UV influence. However, the software still detected
what it thought was the presence of UV and enabled the correction filter. My
guess would be to disable the "optical correction" as the hardware filter
had already done it. Just because the software "thinks" that optical
brightener is present may not mean that it actually is. Roger, I would be
curious about you results.
The UV/Non-UV issue IS something that X-Rite would like to provide a
solution for on the hardware side - which is why the new DTP70 (also due to
ship in late August) has a switchable UV filter - and blistering speed I
might add.
Soren,
About the "linear GCR" curve. There is a distinction between MonacoPROFILER
black-curves and others: in MonacoPROFILER, the user can fully customize the
curve. What that means is that the user can control both start and max
endpoints - as well as curve shape. The user is allowed to "snap" points
onto the black curve and build any shape they wish - including linear. While
we are talking about the black curve, I should also point out the curve
metric. The next time you are in MonacoPROFILER, check out the scale at the
bottom of the curve area - you will notice it goes from 100 (white) to 0
(black). That's because the black generation in based on the conversion from
Lab to device. The black start is actually in L*, so you can figure out at
exactly what incoming L* value that you will start to write black.
Back to the point. Using more black in your separation forces less CMY. If
you look at the printing behavior of Epson printers specifically, you will
find a very "normal behavior" of the black as it increases in density. Yes,
the black has a "bronze" cast to it, but is very stable and easily corrected
(at least, by Monaco software). We have many users using the black
generation setup in this way with Epson printers.
Lastly, GCR does not affect the properties of the ink or the media, only how
output recipes are built. To have consistency between looking neutral and
measuring neutral is at the intersection of a media's physical attributes
and a user's color perception (in other words, it's subjective at best). You
CAN reduce metamerisms is grays by reducing the amount of 3-color component
in the separation - which is what manufacturers like Colorbyte do, and what
users of MonacoPROFILER do when they use a linear GCR curve. Don't be so
surprised that Monaco and Gretag have unique features. I think that we are
still a ways off from seeing one package eclipse the feature set of the
other. Or........maybe we're not........ ; )
That's enough rambling for now. Hope this helps.
M
--
Marc Levine
Sales Guy
Technical Guy
X-Rite Incorporated
Email email@hidden
www.xrite.com
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