[Rd] re: transparency

[Byron Ellis]

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
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