Re: GMGColor .mx4 to icc profiles
Re: GMGColor .mx4 to icc profiles
- Subject: Re: GMGColor .mx4 to icc profiles
- From: Matthew Larmour <email@hidden>
- Date: Wed, 02 Jan 2008 20:58:28 -0800
- Priority: normal
Thanks Thomas.
Outside of GMG, is anyone smoothing measurement data prior to building conventional ICC profiles? Or is it really not required as profiling apps generally do this automatically prior to building the profile?
Matthew Larmour
----- Original Message -----
From: Thomas Holm/pixl <email@hidden>
Date: Wednesday, January 2, 2008 12:40 am
Subject: Re: GMGColor .mx4 to icc profiles
To: Matthew Larmour <email@hidden>
Cc: email@hidden
>
> On 02/01/2008, at 01.02, Matthew Larmour wrote:
>
> > Hi Thomas,
> >
> > Could you elaborate how you go about doing this? What sort of
> a
> > "curve tool" do you use for this?
>
> Sure:
> In GMG's PRofile Editor make a new MX4, import either en ICC
> profile
> or LAB measurement data, select calculate with target (It
> doesn't
> matter much which gamut/printer select but it is preferable if
> it is
> well behaved (no inherent kinks)- such as Fogra 39 dataset.
>
> Then in 4-D color view, under Tools open Graphic View (curve tool).
> You are now looking at the cyan axis (all cyan grid points).
> by
> clicking on the right arrow under Magenta you can scroll through
> all
> combinations of CMY with no Black (when you hit 100% and keep
> going
> Yellow will automatically increase by 1 increment). After doing
> this
> select 20% K and repeat the procedure and then 40% K, repeat etc
> and
> then finish off with the Key axis.
> What you are looking for, in a few words, is weird curves.
> IE: If on some greenish color you have a smooth yellow curve,
> but on
> the next increment have one which at one spot is negative (say
> 50% has
> a lower value then 40%) but on the next increment it is fine
> again,
> you almost certainly have a problem.
>
> With some experience you can figure out whether you will need
> to
> smooth, or rather, how much. I find that even measurement data
> for
> inkjet printers which are pre linearized will benefit from
> some
> smoothing.
>
> Hope this helps.
>
> Med venlig hilsen
>
> Thomas Holm / Pixl Aps
> --
> - Farvestyrings Konsulent
> - Undervisning og foredrag: Adobe Photoshop, Farvestyring, workflow
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> - Medlem, ColorManagementGroup.com
> - Gazelle virksomhed i 2007
>
> - www.pixl.dk · email@hidden
> ----
>
>
>
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