[XeTeX] "Options for all fonts" : colo[u]r, and the transparency byte

[Philip TAYLOR (Webmaster, Ret'd)]

Will Robertson's "/X/?/TEX reference guide/" reads (in part)

> color=RRGGBB[TT]
> Triple pair of hex values to specify the colour in RGB space, with an 
> optional
> value for the transparency.

However, experimenting with all possible values from "00" to "FF"
for the transparency byte seems to have zero effect, in that the
second element laid down completely obscures whatever lies
beneath it.  What am I missing, please ?

Philip Taylor
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