plot - How can I remove the strange white margin around my .png (plotted with r, ggplot)? -

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i save plots ggplot .png. background has black, there allways small white margin (only top, down left; not right).

how can remove margin?

thank you!

here code

library(ggplot2) require(grid)   dat <- data.frame("xvar"=runif(500, 1, 10),                "yvar"=runif(500, 1, 10))  n <- 1 for(i in 1:n){ png(file=paste("green", i, ".png", sep=""), width=400, height=400)   x <- sample(500, 50)   <- ggplot(data=dat[x,], aes(x=xvar, y=yvar))+ geom_point(col="green", size=3,shape=15)+   theme(panel.background=element_rect(fill="black"), panel.grid.minor=element_blank(),      panel.grid.major=element_blank(), axis.text.x=element_blank(), axis.text.y=      element_blank(), axis.title.x=element_blank(), axis.title.y=element_blank(),     axis.ticks=element_blank(), plot.background=element_rect(fill="black"),      panel.margin = unit(c(0,0,0,0), "cm"), plot.margin = unit(c(0,0,0,0), "cm"))+   scale_x_continuous() print(i) dev.off() }

example

enter image description here

the line seeing default outline colour of plot.background rectangle element. can remove setting colour na in theme() call:

theme(plot.background=element_rect(fill="black", colour=na))

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