[gradsusr] Fwd: Command produces a PNG image with transparent color 0 and a background image NE.png

Sat Nov 6 16:50:01 EDT 2010

Hello,

this type map has from all globe ? where can do donwload (site)? how was
from attach in grads with my data of the model rams variable precipitacion?

thanks very much

---------- Forwarded message ----------
From: Mark Sponsler <msponsler at comcast.net>
Date: 2010/11/5
Subject: Re: [gradsusr] Command produces a PNG image with transparent color
0 and a background image NE.png
To: GrADS Users Forum <gradsusr at gradsusr.org>

Hi Jeff,

I do this all the time. It's really pretty simple once you get it figured
out once. It works with even early revs of Grads, like back to 1.9. I don't
use imagemagik for basic displays, but you can to produce some fancier
effects.  Here's the basics:

So for something like precip here's what I do:

First just plot the basic precipitation

  'set mpdset worldmap'
  'set mpdraw on'
  'set map 0 1 1'

   'set clevs 0 .01 0.1 0.2 0.4 0.6 0.8 1.0 1.3 1.7 2.0 2.3 2.7 3.0 3.3 3.7
4.0 4.5 5.0'
   'set ccols 0  0   40  70  71  72  73  88  28  29  78  30  31  80  81  82
83  84  85  85'
   'd apcpsfc'

Then print your image to a png

   'printim c:/grib/dods_eta_output/test.png png -b
c:/grib//background/imagname.png -t 0 x700 y541 white'
   'clear'

This produces the image 'test.png'

Then finish your graphic by adding contours, maybe another shaded
overlay and other stuff:

**Low Pressure**

   'set gxout contour'
   'set cint 2'
   'set ccolor 80'
   'set clab on'
   'set cthick 5'
   'set clskip 2'
   'set clopts 80 2 0.09'
   'set cmax 1011'
   'd prmslmsl/100'
** High Pressure  **
   'set gxout contour'
   'set cint 2'
   'set ccolor 4'
   'set clab on'
   'set clskip 1'
   'set cthick 5'
   'set cmin 1011.1'
   'set clopts 70 2 0.09'
   'd prmslmsl/100'

   'draw map'

Then print your image again.

   'printim 'c/grib/dods_eta_output/precip/'location_name'_'time'hr.png png
-b c:/grib/dods_eta_output/test.png -t 0 x700 y541 white'
   'clear'

I've included the background image (nwcoast.png), the interim image
(test.png) and the final result (nwcoast_84hr.png).

Note - When using foreground images things get a little bit trickier in that
your foreground image needs to first be manipulated in an image editing
program to set some portion of it to be transparent (so the weather data
will bleed through).

Thanks,
Mark

----- Original Message -----
From: "Jeff Chabot" <jsc219 at gmail.com>
To: gradsusr at gradsusr.org
Sent: Thursday, November 4, 2010 5:48:56 PM
Subject: [gradsusr] Command produces a PNG image with transparent color 0
and a background image NE.png

Hello GrADS Users,

I am trying to get a background image behind my precip/ptype products in
GrADS and I am having absolutely no luck.

GrADS versions that I have tried:

Grid Analysis and Display System (GrADS) Version 2.0.a9
Grid Analysis and Display System (GrADS) Version 2.0.a7

Error that I receive:

PRINTIM error: background image open error

printim example that I am using:

printim precip_NE_1.png png x570 y435 -b NE.png -t 0

I am using the full path for the output image and background image, I just
removed it from the above command.

This is the png image that I would like to use (or it will look something
like this):

http://jeffsweatherservice.com/images/NE.png

The above image would be a background to an image like:

http://jeffsweatherservice.com/grads/nam/precip_NE_2.png

Does anyone know how to make this work?  Or does anyone have another way
that I could get a green/brown basemap with blue water to replace the plan
white background?  I have the basemap stencil working on temperature
products, but that will not work well for precip/ptype products.

Any help/insight here would be greatly appreciated.

Sincerely,

Jeff Chabot
jsc219 at gamil.com

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