Re: overprinting backgrounds

[Peter Rolf <indiego@gmx.net>]

Oliver Heins schrieb:
> I have another question.
>
> The print shop wants the background image to be overprinted.  Is it
> sufficiant to set »overprint=yes« once in \setupcolors or does one need
> to explicitely tell the region with \startoverprint ... \stopoverprint?
>
>   
simply use \startoverprint ... \stopoverprint for the text regions. you 
may need to add \startknockout ... \stopknockout for picture elements in 
that region. the "overprint=yes" option is for document wide setting, so 
this is not what you want.
anyhow, if you own a copy of acrobat, you can visualize the overprinted 
elements in the output preview (color warnings).

Peter

> A minimal example:
>
> % \startminimalexample
> \setupcolors[state=start,cmyk=yes,rgb=no,overprint=yes]
>
> \definelayer	[mybg]
> 		[x=0mm, y=0mm,
> 		width=\paperwidth, height=\paperheight,
>                 repeat=yes]
> \setlayer	[mybg]
> 		[hoffset=5cm, voffset=7cm]
> 		{\externalfigure[sample/hacker.jpg][max]}
> \setupbackgrounds[page][background=mybg]
>
> \starttext
>
> Is this sufficiant for overprinting?
>
> \dorecurse{4}{\input tufte\par}
>
> \page
>
> \startoverprint
> Or does one need to explicitely tell context the region?
>
> \dorecurse{4}{\input tufte\par}
> \stopoverprint
>
> \stoptext
> %\stopminimalexample
>
> Thanks again,
>  olli
>
>   

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