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

[Stefan Gofferje]

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

-- 
Suomen Sääkeskus - Hyvä sää on makuasia

Stefan Gofferje
Haukantie 2 B 5
FIN-37600 Valkeakoski
GSM:       +358 (41) 7290730

http://www.saakeskus.fi/
stefan at saakeskus.fi


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