Re: Inkjet Ink restrictions
Re: Inkjet Ink restrictions
- Subject: Re: Inkjet Ink restrictions
- From: John W Lund <email@hidden>
- Date: Tue, 03 Jun 2008 11:26:59 -0700
Hello Scott,
There have been a couple issues with ColorBurst's use of chroma for
linearization, though. One is the fact that optical brighteners in the media
will break the process unless you use a UV-cut spectro.
Also, they seem to be evolving their recommendations for which tool(s) to
use for ink limits & linearization. They came up with a L*a*b*-based & now a
Lightness-based method in addition to the original chroma one. (maybe you
know how "Lightness" differs from L* in L*a*b* - I don't)
For new media, I believe the recommended strategy is to use chroma-based
measurements for initial per-channel ink limits, then switch to a
Lightness-based method to build the linearization file itself. As for
setting total ink limits, they offer only a visual evaluation technique.
So I guess this all adds up to portray this ink limiting thing as still
pretty complicated. (Duh!) I too would like to see some simplification &
better use of instruments to help me through this critical step.
Regards,
John
JWL Images
Emeryville, CA
Scott Martin <email@hidden> wrote:
>
> On Jun 2, 2008, at 6:25 AM, Mark Rice wrote:
>
> ...<snip>...
>
>> I would like to see a method of generating initial ink restrictions
>> based on
>> density values and some form of gray balance throughout the
>> linearization
>> range.
>
>
> For this we might look at ColorBurst's process for ink limiting. Their
> process involves studying chroma values and placing the ink limiting
> where chroma stops increasing. This chroma process proved to be a nice
> improvement over watching density values alone. After the inks limits
> are set, proceed with Lab based grey balance linearization...
>
> ...<snip>...
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