Re: scum dot (was The Imageprint Answer)
Re: scum dot (was The Imageprint Answer)
- Subject: Re: scum dot (was The Imageprint Answer)
- From: Marc Levine <email@hidden>
- Date: Mon, 27 Jan 2003 08:50:52 -0500
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From: email@hidden
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Reply-To: email@hidden
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Date: Sun, 26 Jan 2003 22:00:31 -0800
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To: email@hidden
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Subject: colorsync-users digest, Vol 3 #619 - 5 msgs
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Actually Marc its funny your chimed in. I've had fine luck using Profiler 4.5
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with IP, I've been profiling ala RGB with the larger patch count target, the
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problem is that there is ALWAYS a scum dot, under a loupe I can see just the
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smallest amount of ink getting thrown down where I should have paper white.
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Monaco tech support mentioned trying different rending intents, of course this
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didn't solve the problem and I didn't expect it would. I'd love to solve this
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little problem if you have any suggestions as I really like the profiles
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Monaco generates otherwise.
Hey Chris,
This is a pretty simple thing to resolve in MonacoPROFILER. Before I tell
you how easy this is, I should clarify that, when using some CMMs, a dot can
be generated in the "white" area of image. There's really nothing the
profile can do about this. In the case of it actually being a function of
the profile - 2 things can be done.
1) Use the "Fine-Tune" tool. This tool allows you to select a "color" and
manipulate it in the device space - in this case RGB. If the profile is
making the dot, you will see a device value below 255,255,255 when selecting
a "white" area in the image. After you've selected your color, you'll be
able to change the device value and the lightness/color range of the edit.
You can also click over to the "neutrals" tab and adjust device values for
any of your grays. If the software IS reporting a 255,255,255 value, I would
look to the CMM transform in the RIP as the culprit.
2) The other thing you could do is use the device curves editor. This is a
more primitive method, but could possibly work. An output curve is basically
a 1-D Lut and by setting the input value of 254 to 255 (I'd probably do this
on all 3 curves), you might be able to "clip" out the tint.
Again, if the RIP is doing this there's not much a profile can do to
overcome it. A quick transform in Photoshop should tell the story. Keep in
mind that, when using the perceptual intent, it is not necessarily RELATIVE
the way the relative colorimetric is. By this I mean that it IS possible
that a profile would put a dot in a "white" area (this is why tech support
asked you to try different intents). Nonetheless, if the profile is printing
a dot, you should be able to see it in the editor and will be able to easily
identify and correct.
Please let tech support know if you have any further questions.
-Marc
--
Marc Levine
North American Sales Manager
Technical Sales Engineer
Monaco Systems
email@hidden
www.monacosys.com
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