From bellis@hsph.harvard.edu  Fri Aug 10 23:37:08 2001
From: bellis@hsph.harvard.edu (Byron Ellis)
Date: Fri, 10 Aug 2001 18:37:08 -0400 (EDT)
Subject: [Rd] re: transparency
In-Reply-To: <3B7454DA.688106FC@stat.auckland.ac.nz>
Message-ID: <Pine.GSO.4.10.10108101834440.14782-100000@hsph.harvard.edu>

IMHO that would be a Good Idea. It would also make people less inclined to
use color references to mean things other than color.

Byron Ellis (bellis@hsph.harvard.edu)
"Oook" - The Librarian

On Sat, 11 Aug 2001, Ross Ihaka wrote:

> Rather than a yes/no tranparency indicator, should we consider using
> entire "unused byte" as an alpha-channel? (meaning that we specify
> transparency as a value in [0,255]).  Many graphics/paint programs (e.g.
> gimp) do this sort of thing.  Transparency would need to be device
> dependent, but a simple yes/no transparency could be obtained by
> thresholding the alpha value.  This would entail a change to way indices
> into colour palettes are handled, but Peter D has pointed out that this
> is currently broken anyway.
> 
> The rendering extension to the X server includes support for
> transparency and this might be a place to look for how screen devices
> should behave.
> 
> 	Ross
> -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
> r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
> Send "info", "help", or "[un]subscribe"
> (in the "body", not the subject !)  To: r-devel-request@stat.math.ethz.ch
> _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
> 

-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-devel-request@stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._


[Rd] re: transparency
Byron Ellis