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20040121: 20040121: changing background color in garp image products

>From: "Neil R. Smith" <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200401212255.i0LMtGp2023636

>On Wed, 2004-01-21 at 15:00, Unidata Support wrote:
>> >From: "Neil R. Smith" <address@hidden>
>> >Organization: UCAR/Unidata
>> >Keywords: 200401211912.i0LJCDp2013860
>> 
>> >Is there a way to change th background color in garp
>> >image products? I can't print these things with solid black
>> >background all day without taking out a loan.
>> >Thanks, -Neil
>> >-- 
>> >Neil R. Smith, Comp. Sys. Mngr.             address@hidden
>> >Dept. Atmospheric Sci., Texas A&M Univ.     979/845-6272 FAX:979/862-4466
>> >
>> 
>> Neil,
>> 
>> You could either:
>> 
>> 1) Print as postscript directly from nmap2 instead convering the gif from 
>>    garp for your printer. The NMAP postscript output will invert the black
>>    and white for just the reason you mention.
>How do I convert the garp gif using nmap2? How do I get nmap2 to open
>the the .gif file? I not be reading you right.

I was saying to create you display in nmap2, then click on "print".

>> 2) create a modified color table with the minimum data value set to white
>>    instead of black.
>Where are those color tables for garp located?

The gempak satellite and radar image enhancements are in $GEMTBL/luts.

>> 3) Use an external graphics program that can manipulate the gif color
>>    index setting black to white.
>like xview?

I don't have xview, but can do this with xv interactively, or
on the command line with programs like gifsicle, such as:
gifsicle --change-color "#ffffff" "#000000" \
   --change-color "#000000" "#ffffff" \
   gemtest.gif > gemnew.gif


The above command would change black to white, and white to black from the
input file gemtest.gif and create a new file called gemnew.gif.
Really, this is the easiest way to take a bunch of files you already
have and process the load really quick and painlessly.

Steve Chiswell




>> 
>> Steve Chiswell
>> 
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>-- 
>Neil R. Smith, Comp. Sys. Mngr.                address@hidden
>Dept. Atmospheric Sci., Texas A&M Univ.        979/845-6272 FAX:979/862-4466
>
--
NOTE: All email exchanges with Unidata User Support are recorded in the
Unidata inquiry tracking system and then made publically 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.