Re: Making RGB profiles with Monaco Profiler
Re: Making RGB profiles with Monaco Profiler
- Subject: Re: Making RGB profiles with Monaco Profiler
- From: Marc Levine <email@hidden>
- Date: Fri, 24 Jan 2003 14:34:16 -0500
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From: email@hidden
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Reply-To: email@hidden
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Date: Thu, 23 Jan 2003 22:01:42 -0800
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To: email@hidden
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Subject: colorsync-users digest, Vol 3 #612 - 11 msgs
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> I am making RGB profiles for true RGB devices such as Oci LightJet and
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> Durst Epsilon.
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> I cant really figure out if I should use Monaco's linearize option in
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> making the profiles since the LightJet has some kind of a Calibration
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> cycle and the Epsilon does its own linearizing every morning.
Dikta,
I can see on the list that you have had a few responses to this issue. So,
here I am chiming in. Everybody pretty much hit the nail on the head about
the purpose of linearization: to establish a baseline printing condition for
a device that, once established, can be returned to by performing a small
set of measurements.
The other thing that linearization does is optimize the way your device
prints by correcting variations in tone development. In other words, if I am
using a printer that does not build density evenly, a linearization curve
will improve the consistency of tone (separation between different lightness
levels) as you build density.
OK. To properly establish a baseline condition, you really need to isolate
the individual channels to properly understand how a device is printing.
This is why CMYK linearization ramps are used for CMYK devices. Pretty
straight forward. With RGB it's a little different. With a "fuax RGB" device
such as your typical desktop printer, there's no isolating anything as the
driver is forcing you to deliver RGB, even though the device is printing in
various flavors of CMYK. In such a case, I would not use linearization as a
process control step (baseline condition). However, linearization can be
used to open the tone of your image, which may result in a better profile.
The same holds true for a true RGB device (such as the Light Jet). I believe
that the Light Jet uses RGB lasers, which means it basically prints in CMY
according to the response of the lasers. As a result, an RGB ramp won't
really isolate and correct laser behavior. Nonetheless, linearization may
benefit your target in the same way it benefits a "faux RGB" device.
So.......long story short: RGB linearization should not be used as a process
control step, but may be used to further optimize the way your device is
printing. I would definitely recommend using the utilities supplied with the
printers to establish a baseline printing condition and to keep the color
running consistently.
Feel free to contact me off line to talk more about the epsilon - I'm not
really familiar with that device.
-Marc
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