[gradsusr] How to plot two different SHADED fields?

[Mireieta]

Thank you everybody! The maskout worked! But I had to change the zeros
of my field (where it sould be transparent) by negative numbers! :)

Mireia

2012/2/29 Arlindo da Silva <dasilva at alum.mit.edu>:
> 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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-- 
Mireia