Re: Color separation

[Hans Hagen <pragma@wxs.nl>]

Duncan Hothersall wrote:
> Sorry for all the messages; I am exploring things I don't really 
> understand. I hope someone can enlighten me!
> 
> With the following colour set-up:
> 
> \setupcolors[rgb=no,cmyk=yes,spot=yes,state=start]
> \definecolor[PantoneTwoNineFour][c=1,m=.56,y=0,k=.18]
> \definecolor[IFSbluetabletint][PantoneTwoNineFour][p=.15]
> 
> and then using this tint as a textbackground and also as a 
> backgroundcolor in frames, I am getting complaints from my printers that 
> black overprinted on the tint is 'knocking out' the tint and leaving 
> white on the separated plate.
> 
> I have read and re-read the useful msplit.pdf which suggests that the 
> implicit criterium=all will negate this effect, but perhaps I have 
> misunderstood?
> 
> Two questions:
> 1. how can I stop black overprinting from knocking out the tint, and
> 2. is there a way I can check that it is working properly without 
> sending it to the printer each time?
> 
> Thanks as ever for any help. Do I need to post example output?

whow, a demanding color user -)

see mag-0006.pdf for more info on properties


\setupcolors[state=start,textcolor=cyan,overprint=yes]

\setupbackgrounds[page][background=color,backgroundcolor=magenta]

\starttext

\input tufte

\startproperty[knockout]\input tufte\stopproperty

\startproperty[overprint]\input tufte\stopproperty

\input tufte

\stoptext



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