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

[Jennifer Adams]

Transparent colors will be in the release of GrADS 2.1 that has the option to use the cairo library to do the graphics rendering. There's still a lot of work to do before the release is ready, I'm sorry I have no estimate. Here's a sample of what will be possible. --Jennifer



On Jun 26, 2012, at 6:32 PM, 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
> 
> -- 
> 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
> 
> 
> --------------------------------------------------------------------------------
> This mail was scanned for malware by ClamAV (http://www.clamav.net/)
> --------------------------------------------------------------------------------
> 
> 
> _______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr

--
Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Calverton, MD 20705
jma at cola.iges.org



-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://gradsusr.org/pipermail/gradsusr/attachments/20120626/46aeed57/attachment-0003.html 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: ex10.png
Type: image/png
Size: 249561 bytes
Desc: not available
Url : http://gradsusr.org/pipermail/gradsusr/attachments/20120626/46aeed57/attachment-0003.png