[scribus] LSI 240% ink limit.

[John Culleton]

On Saturday 08 August 2009 11:58:40 am Gregory Pittman wrote:
> On 08/08/2009 11:57 AM, John Culleton wrote:
> > On Friday 07 August 2009 07:19:29 pm John Culleton wrote:
> >> LSI is enforcing a rule that total ink coverage of any CMYK
> >> color cannot exceed 240% The usual example is rich black.
> >>
> >> 1. Can this be a problem in Scribus?
> >> 2. If so, how does one detect/fix such overcolored areas?
> >>
> >> I presume that none of the standard colors exceed this limit.
> >> But I worry about graphics from e.g., Gimp which are RGB
> >> converted to CMYK when Scribus writes the file.
> >
> > To further illuminate the question, these are the recommended
> > values whan using Photoshop:
> > ------------------------
> > Engine: Adobe (ACE)
> > Intent: Relative Colorimetric
> > Use Black Point Compensation: Yes
> > Use Dither: Yes
> > -------------------------------
> > and
> > -----------------------------------
> >      Ink Colors: SWOP (Newsprint)
> >      Dot Gain: 25%
> >      Separation Type: GCR
> >      Black Generation: Medium
> >      Black Ink Limit: 100%
> >      Total Ink Limit: 240%
> >      UCA Amount: 0%
> > -------------------------------
> > for the custom CMYK settings.
> >
> > Perhaps there is an ICC profile that can take care of all this.
>
> I don't know that there are any color sets that come with Scribus
> that will exceed this. Of course, we get some list questions from
> some who think that they want all the CMYK saturated, but
> obviously don't understand the printing issue.
>
> What it does suggest, though, is that one of the things the
> Preflight Verifier could do would be to check for ink limits.
> Maybe you could file an RFE.
>
> Not sure how they might imagine someone specifying > 100%
> Black...seems that would be kicked out by the printing equipment.
>
> Greg
>
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Consider the image from Gimp that has black on it. That is RGB 0 0 
0. What would Scribus change it to in CMYK?


-- 
John Culleton
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