I need to output ggplot2 graphics from R to PNG files with transparent background. Everything is ok with basic R graphics, but no transparency with ggplot2:
d <- rnorm(100) #generating random data
#this returns transparent png
png('tr_tst1.png',width=300,height=300,units="px",bg = "transparent")
boxplot(d)
dev.off()
df <- data.frame(y=d,x=1)
p <- ggplot(df) + stat_boxplot(aes(x = x,y=y))
p <- p + opts(
panel.background = theme_rect(fill = "transparent",colour = NA), # or theme_blank()
panel.grid.minor = theme_blank(),
panel.grid.major = theme_blank()
)
#returns white background
png('tr_tst2.png',width=300,height=300,units="px",bg = "transparent")
p
dev.off()
Is there any way to get transparent background with ggplot2?
This question is related to
r
graphics
transparency
ggplot2
There is also a plot.background
option in addition to panel.background
:
df <- data.frame(y=d,x=1)
p <- ggplot(df) + stat_boxplot(aes(x = x,y=y))
p <- p + opts(
panel.background = theme_rect(fill = "transparent",colour = NA), # or theme_blank()
panel.grid.minor = theme_blank(),
panel.grid.major = theme_blank(),
plot.background = theme_rect(fill = "transparent",colour = NA)
)
#returns white background
png('tr_tst2.png',width=300,height=300,units="px",bg = "transparent")
print(p)
dev.off()
For some reason, the uploaded image is displaying differently than on my computer, so I've omitted it. But for me, I get a plot with an entirely gray background except for the box part of the boxplot which is still white. That can be changed using the fill aesthetic in the boxplot geom as well, I believe.
Edit
ggplot2 has since been updated and the opts()
function has been deprecated. Currently, you would use theme()
instead of opts()
and element_rect()
instead of theme_rect()
, etc.
Just to improve YCR's answer:
1) I added black lines on x and y axis. Otherwise they are made transparent too.
2) I added a transparent theme to the legend key. Otherwise, you will get a fill there, which won't be very esthetic.
Finally, note that all those work only with pdf and png formats. jpeg fails to produce transparent graphs.
MyTheme_transparent <- theme(
panel.background = element_rect(fill = "transparent"), # bg of the panel
plot.background = element_rect(fill = "transparent", color = NA), # bg of the plot
panel.grid.major = element_blank(), # get rid of major grid
panel.grid.minor = element_blank(), # get rid of minor grid
legend.background = element_rect(fill = "transparent"), # get rid of legend bg
legend.box.background = element_rect(fill = "transparent"), # get rid of legend panel bg
legend.key = element_rect(fill = "transparent", colour = NA), # get rid of key legend fill, and of the surrounding
axis.line = element_line(colour = "black") # adding a black line for x and y axis
)
As for someone don't like gray background like academic editor, try this:
p <- p + theme_bw()
p
Source: Stackoverflow.com