followup to transparent image problem

[Stuart Maclean]

Ha, so two minutes after posting my previous question, I found the 
solution.  DisplayRenderer's and VisADCanvasJ2D's calls to 
setBackgroundColor do not cater for an alpha channel.  With that in 
place, I get my desired transparent pngs. Yippee

Can the transparency option be added to a future VisAD release ?

Stuart

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