[R] Create *png or *.jpeg plot under Linux

[Bio7]

I have an example where i plot an image and load it dynamically in an image
analysis tool to create
a film (dynamic graph). This works well under Windows but i can't plot to
*.png or *.jpeg files 
under Linux (Ubuntu) with the same command.

I'm using:
  
png(file,width=200,height=200) or jpeg(file,width=200,height=200)

Any help is appreciated

With kind regards

Marcel
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