Re: Lightness edits
Re: Lightness edits
- Subject: Re: Lightness edits
- From: Marc Levine <email@hidden>
- Date: Sat, 30 Mar 2002 02:58:51 -0500
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From: email@hidden
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Reply-To: email@hidden
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Date: Fri, 29 Mar 2002 22:12:25 -0800 (PST)
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To: email@hidden
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Subject: colorsync-users digest, Vol 3 #145 - 7 msgs
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> Andre writes,
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> I wonder if it is possible to edit a profile to a different black
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> point or, in other words, make the simulation of the blackest black
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> lighter or darker than actual (abscol + rel col). Edit the profile
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> in ColorBlind for instance just changes L within its own range. Does
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> a program or procedure exist to achieve this?
Andre,
I believe that the answer to your question may be simple (I'm sure somebody
will jump in and correct if necessary) You may recall using an eye-dropper
in Photoshop to remap the white-point of an image.....well profile editing
most likely works the same way. In the Photoshop, when you use the
white-point dropper, you can scroll through the curves and see that what
really happened is that the endpoints of each color curve have been shifted
accordingly. By this method, you could shift white-point, black-point, and
control image color cast.
You must also remember that a profile contains two basic types of data -
input/output tables (1 set for each rendering intent), and curves. What
we're talking about here is the curve part. I think that the curve edits are
typically easier to engineer and are supported in most capable profile
editors (Colorblind Edit, Gretag Profile Editor, MonacoPROOF,
MonacoPROFILER) You may have seen Derrick's response regarding Colorblind's
capabilities. I would bet money that this particular function is a simple
curve edit under the hood. Anyhoo, Photoshop is a great way to test your
skills with curve edits. If you have a copy, I would play around and see if
you could get a little savvy going. Once you get the concept down, you will
likely be able to affect the same types of edits/results in an upscale
profile editor (if you have one).
If you decide to do this, I would also recommend using Photoshop to do a
"Convert to Profile" transform prior to making your adjustments and print
with no color management. That way you will be making changes to your image
the same way your edited profile will. Hope this helps.
Marc
--
Marc Levine
Technical Manager
Monaco Systems
Sales Division
www.monacosys.com
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