On Jun 4, 2012, at 5:45 AM, Jan Pohanka wrote:

>> See page 204, section 8.5 of the metafun book
>>
>> loadfigure "gracht.mp" number 1 scaled .5 ;
>> addto currentpicture also
>> (currentpicture softened .8)
>> shifted (bbwidth(currentpicture)+.5cm,0) ;
>>
>
> thank you for the hint, but it seems, that softened does not work for 
> externalfigure
>
> \startMPcode
> draw externalfigure "logo.pdf" scaled 5cm softened 0.5;
> \stopMPcode
>
> <inserted text> ...lable:=true; ;;;;]===], false)}
>
> \meta_process_graphic ...!!es , \MPaskedfigure )}}
>                                                  \egroup \placeMPgraphic \m...
>
> regards
> Jan

What about drawing a translucent white rectangle over the graphic?

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