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Hi Kwan, re: > Yes, I first made a 6400x4800 GIF file for the 1-km US radar image. Then I > plotted the same radar image using MAG=-2 but with half of the original > dimension (i.e. 3200x2400). Then I overlaid the surface data onto this > half size image, and set EU MAKE 0 255 BLACK and save this as a GIF file > (so only surface data are now shown). I then make the black background of > the GIF file transparent using ImageMagick and overlaid this onto the > 6400x4800 GIF file to get the final product. But I found the plotted data > are a bit too dense. OK, I understand what you are trying to do. Unfortunately, I know of no remedy for your problem except to either blow down the image (like you noted you did); plot surface data over the blown down image; and then save the result as a GIF. Cheers, Tom -- **************************************************************************** Unidata User Support UCAR Unidata Program (303) 497-8642 P.O. Box 3000 address@hidden Boulder, CO 80307 ---------------------------------------------------------------------------- Unidata HomePage http://www.unidata.ucar.edu **************************************************************************** Ticket Details =================== Ticket ID: VSG-323612 Department: Support McIDAS Priority: Normal Status: Closed =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.