[gradsusr] How to plot two different SHADED fields?

[Arlindo da Silva]

On Tue, Feb 28, 2012 at 3:56 AM, <davide.sacchetti at arpal.gov.it> wrote:

> **
> 2 chances:
> 1) set gxout shade
> display first field
> display second field with maskout (undef value are transparent but you see
> the grid boxes)
> 2) set gxout shade2b
> display first
> set ccols using -1 where you want transparency
> display second
>
>
If you use opengrads you can define a transparency level (from fully
transparent to opaque, continuously) with the set_rgba command. This alpha
channel capability is only applicable for generating images with gxyat
(also part of opengrads). Type "gxyat" and "set_rgba" without arguments at
the "ga->" prompt for a manual page. Gxyat uses anti-aliasing to produce
images that generally have nicer font rendering than "printim".

   Arlindo



-- 
Arlindo da Silva
dasilva at alum.mit.edu
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