[gradsusr] Feature suggestion - Add alpha channel / transparency value to 'set rgb'

[Jeff Lake]

correct setting of color specs when an Alpha channel is invloved
is RGBA

-Jeff Lake
MichiganWxSystem.com
WeatherMichigan.net
TheWeatherCenter.net
GRLevelXStuff.com

On 6/26/2012 18:32, Stefan Gofferje wrote:
> Hi,
>
> with the introduction of 'draw shp', it is now possible to create more
> optically pleasing charts which is an important point if you render
> charts for a mainstream audience. 'gxout shaded', however still produces
> solid coloring which partially negates that advantage.
>
> I would like to propose to add a transparency value to the 'set rgb'
> command, such as 'set rgd <no> <red> <green> <blue> <transparency>'.
>
> With such an option, it would e.g be possible to create gradients of the
> same color but with varying transparency.
> With this it would be possible to render e.g. cloud-cover or
> precipitation maps which are easily grasped by a mainstream audience.
>
> Additionally, it would be possible to render meaningful composite charts
> with multiple parameters, where overlapping contour plots would produce
> very confusing images.
>
> Greetings from Finland,
> Stefan
>