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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