Hi Cicero, Did you try display.getGraphicsModeControl().setMissingTransparent(true)? -Curtis At 10:52 AM 3/4/2002, you wrote: >Hi everybody: > >I´m using VisAD to visualize radar and lightling data. Now I've inserted also >a GIF image on the background by visad.data.gif.GIFForm. The image is apearing >behind all the other data, as it shoud. > >The problem is that I could not make the undefined radar data invisible (alpha >=0). I´m using a Integer2DSet and setting the points outside the radar range >to Float.NaN but these points apear on the display´s background color. > >I also tried to map to RGBA instead of RGB but didn´t worked either. > >Thanks already Cicero A. W. Z.