Re: Xproof - was: linearization - luminance, chroma or density?
Re: Xproof - was: linearization - luminance, chroma or density?
- Subject: Re: Xproof - was: linearization - luminance, chroma or density?
- From: John W Lund <email@hidden>
- Date: Wed, 24 Jan 2007 18:13:27 -0800
On 1/24/07 12:02 PM, "email@hidden"
<email@hidden> wrote:
Marco Ugolini <email@hidden> wrote:
>
> Hi Clark.
>
> You mention ColorBurst: I assume you mean XProof.
>
> ..<snip>...
>
> I just went through a tough time linearizing and profiling Epson's Single
> Weight Matte Paper on a client's 4800. Two problems proved to be big
> head-scratchers:
>
> 1) After linearizing and profiling, the print had a distinct yellow tone in
> the highlight areas where there was any value at all above pure white.
-- this is a pretty well-documented issue related to ColorBurst's use of
chroma values for linearization: if you try to use an non-UV spectro to
linearize a paper with OB's, the lin file results in yellow-ink-contaminated
highlights. Profiling s/w (I tried ProfileMaker Pro) seems unable to fix
this.
> 2) The shadow areas were heavy and plugged up, far more than would be
> reasonable to expect in a matte paper. There was considerably more ink in
> those areas than was to be expected in the circumstances. (Incidentally,
> even using the OEM environment, the shadows appear similarly heavy.)
-- this sounds like a catch-22: the OEM linearization perhaps did not "fit"
your printer well - normal course would be to re-linearize, but then since
your spectro is not a UV-cut model, you won't get a good lin file...
> Do you have a tested-and-true procedure to
> determine the per-channel ink limits in ColorBurst XProof? And on top of
> that there is another ink limit setting to grapple with (320% in the OEM
> environment). The mystery does thicken considerably...
-- In their defense, ColorBurst does have a pretty active support forum:
<http://www.colorburstrip.com/forums>
There are a couple of threads exploring/explaining their take on ink
limiting, and even tweaking light cyan & light magenta curves in search of
better highlight separation.
I'm not Clark, but HTH anyway.
Regards,
John
JWL Images
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