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George, To manipulate the group 4 fax images, we have used the packages "netpbm" and "Imagemagick". Imagemagick is a freely available piece of software and will convert from the fax format to any of its known formats. Here is the Imagemagick url: ftp://ftp.wizards.dupont.com/pub/ImageMagick/ They have binary installations on that server which are great. Otherwise if you build from source you will have to download the tiff, jpg, mpg libraries separately to link against. The distribution is updated fairly regularly which is why I prefer it to netpbm. You can display the fax charts with imagemagick like: display -geom 50% -rotate 90 difax.fax or convert formats like: convert difax.fax difax.ps The netpbm package is nice for piping straight to a device. Netpbm is just pbmplus with a few additions (can be found on ftp.uu.net). We do have a difax mailing list which is archived here at: http://www.unidata.ucar.edu/glimpsedocs/ghdifax.html I searched the list above, and did find an example of a script that is used to print the difax images from the IDD using the g3topbm program: http://www.unidata.ucar.edu/glimpse/difax/72 If you have any specific questions about the IDD difax service, Linda Miller may be able to provide more information. Good luck, Steve Chiswell Unidata User Support chiz@xxxxxxxxxxxxxxxx On Fri, 5 Sep 1997, George Huffman wrote:
Steve - thanks for the chance to actually meet you and to discuss the NUDS. Indeed, the problem with the TIF files of DIFAX products was that XV was subsetting the file on the fly to get it to fit the screen. So, the NWS site does have nice maps after all, and firing up xv with the -nolimit option allows me to get them out at full resolution. Is any of the software for managing/printing DIFAX charts contained on the Unidata server, or do we need to contact individual sites that have done it? GJH