Re: [NTG-context] Overlays as background in textbackground

18 May 2016


      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"  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  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

Re: [NTG-context] Overlays as background in textbackground

Alan BRASLAU