readPNG gives warnings and doesn't execute sample code from help files
Joris Meys <jorismeys <at> gmail.com> writes:
I believed the standard plotting device on R in 2.12.1 would support per-pixel alpha. It does support alpha, as plot(1:2,type="l") polygon(c(1,1,2,2),c(1,2,2,1),col=rgb(60,100,60,60,maxColorValue=255)) plots correctly. Which device should I use then?
See http://developer.r-project.org/Raster/raster-RFC.html (near the bottom of the page, where it explains that the Windows device supports alpha but not per-pixel alpha ...) cheers Ben Bolker