Re: Please check this conifg for me and give your opinion
Re: Please check this conifg for me and give your opinion
- Subject: Re: Please check this conifg for me and give your opinion
- From: Marco Ugolini <email@hidden>
- Date: Wed, 28 Mar 2007 23:03:44 -0700
In a message dated 3/27/07 11:25 PM, John W Lund wrote:
> As discussed at length back then, [ColorBurst] chose to use chroma values
> for linearization. Papers with optical brighteners read as "blue" to non-UV
> spectros, which makes for problems linearizing the Y ink. Not a matter of
> anything getting "remade".
Now that XRite and GretagMacbeth are one, and that the ProfileMaker way of
detecting FWAs in software is readily available to XRite products as well, I
would hope that the chroma route to linearization will not mean that we
still have to double our investment in spectrophotometers just because we
need a UV-cut unit to linearize our RIPs. Say what you will, but that is not
very practical.
> A completely separate issue is the fact that if a user wants to
> *relinearize* a Colorburst-created environment, he/she must use a UV-cut
> spectro because that's what they used to create the lin file in the first
> place.
Which ends up sounding quite a bit like circular logic.
> You can still use a non-UV spectro, just be advised that it may be
> problematic (read: failure) trying to linearize a paper with OBs. This does
> *not* seem to be an issue in papers with 'neutral' whites.
>
> Also, in v.5 Colorburst provides an option for L*a*b*-based linearization -
> maybe this will allow use of non-UV spectros for all linearization &
> profiling? I don't know because I haven't tried it yet...
One can hope...
> -- as I understand it, the "Correct for Optical Brightener" function
> applies only to the perceptual rendering intent, not to RelCol. That's great
> for my fine art printing, but can pose some issues for a proofing workflow.
I've heard that rumor before, and I just wish that someone with better and
more reliable inside knowledge than the rest of us would come and set us
straight one way or the other.
Marco Ugolini
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