Here is a trick (due to Hans, of course) to produce a watermark image.
You can play with the idea in order to produce your own effect.
\definecolor [percent] [s=1,a=1,t=.9]
\externalfigure [cow] [background={foreground,color},backgroundcolor=percent]
Alan
On Wed, 18 May 2016 11:55:11 +0000
"Meer, Hans van der" <h.vanderm...@uva.nl> wrote:
> This code from three years back ia a reply to a question of placing
> an overlay background. Because the cow is very black I am curious if
> the \externalfigure can have a paramter to change the alpha of the
> cow, making it more transparent. By the way, it is not out of
> curiosity only. If possible it would forego the need to make separate
> pictures of different transparency beforehand.
>
> > On 15 Jul 2013, at 11:22, Hans Hagen <pra...@wxs.nl> wrote:
> >
> > \definetextbackground [mybackgroundOverlay]
> > [mp=mpos:region:whatever]
> >
> > \startuseMPgraphic{mpos:region:whatever}
> > for i=1 upto nofmultipars :
> > draw textext("\externalfigure[cow.pdf]") rotated 10 shifted
> > center multipars[i] ; endfor ;
> > \stopuseMPgraphic
> >
> > \starttext
> >
> > \startmybackgroundOverlay
> > \dorecurse{10}{\input knuth \par}
> > \stopmybackgroundOverlay
> >
> > \stoptext
>
> Hans van der Meer
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