Re: Profile Gamut vs. Printer gamut
Re: Profile Gamut vs. Printer gamut
- Subject: Re: Profile Gamut vs. Printer gamut
- From: Marc Levine <email@hidden>
- Date: Sat, 05 Apr 2003 09:50:57 -0500
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I am trying to match some supplied color swatches on my inkjet printer.
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I know that the swatches are within the printable gamut of the machine,
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but when I look at the gamut of the profile, the swatches are not
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within the profile's gamut.
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I am looking for a way to expand the profile's gamut to use more of the
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machines color gamut. I am losing some of the color fidelity of the
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machine because of this. I am using Profile City for my profile
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generation.
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I have also used Monaco for profile creation and I know that Monaco has
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the ability to generate output profiles in different rendering intents.
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Would that make any difference?
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Any help would be greatly appreciated.
Hi Mike,
In a color utopia, printer gamut and profile gamut is the same thing. The
reality of the situation is that a profile is really just a mathematical
formula. When you build a profile, a couple of things determine how well the
"formula" fits the device.
-Device "behavior". If you are using a RIP, you might evaluate your
linearization process or look at your ink limiting. If you're working with a
"faux-RGB" printer, then you're really locked out of a lot of this. You can
linearize a device in RGB, but keep in mind that - in doing so - you're not
really isolating and controlling CMY behavior. This is actually one of the
reasons I would recommend a RIP that conveniently drives a CMYK device as a
CMYK device. But I digress. Anywho, the way your device is setup has a
substantial impact on the profile's ability to represent the complete device
color space.
-Profile adaptation. When building a profile, the adaptive capabilities of
the profile-building software can make a huge difference in "fitting" the
profile to the device. In our software, we have a feature called intelligent
black. Typically, a piece of software will need to know what separation
logic to use when building a CMYK image. There are several settings to
control this that provide a lot of flexibility in a number of available
profiling packages. What intelligent black does is go one step further.
Intelligent black dynamically analyzes your data and compares it to the
separation logic. If the software determines that there is a region of the
gamut that the logic does not accommodate, it modifies the logic (or adapts
it) to ensure that you get the maximum available gamut from your profile.
Intelligent black simply allows you to get to colors that you could not get
to with a static logic set. In MonacoPROFILER, the user can select whether
intelligent black is active or not. Most users leave it enabled by default.
In MonacoPROOF, it's always on.
Oh yeah, one more thing. The reason I started writing this reply is that our
software lets you select a "default rendering intent". All the intents are
always built in. In other words, the intent setting is just a default flag
in the profile. When using the profile, you can manually select any intent
you like.
Also, check out the book "Real World Color Management". It has a nice
section on "Round-tripping". Round-tripping is a nice way to quantify what
you're seeing in terms of gamut differences, and gives you a mechanism to
understand how attempts to improve your process really change your results.
Hope this helps,
Marc
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