png {base} | R Documentation |
A graphics device for JPEG or PNG format bitmap files.
jpeg(filename = "Rplot.jpeg", width = 480, height = 480, pointsize = 12, quality = 75, ...) png(filename ="Rplot.png", width = 480, height = 480, pointsize = 12, ...)
filename |
the name of the output file. |
width |
the width of the device in pixels. |
height |
the height of the device in pixels. |
pointsize |
the default pointsize of plotted text. |
quality |
the `quality' of the JPEG image, as a percentage. Smaller values will give more compression but also more degradation of the image. |
dots |
additional arguments to the X11 device. |
Plots in PNG and JPEG format can easily be converted to many other bitmap formats, and both can be displayed in most modern web browsers. The PNG format is lossless and is best for line diagrams and blocks of solid colour. The JPEG format is lossy, but may be useful for image plots, for example.
R can be compiled without support for either or both of these
devices: this will be reported if you attempt to use them on a system
where they are not supported. They will not be not available if R has
been started with --gui=none
(and will give a different error
message).
A plot device is opened: nothing is returned to the R interpreter.
These are based on the X11
device, so the additional
arguments to that device work, but are rarely appropriate. The
colour handling will be that of the X11
device in use.
Guido Masarotto and Brian Ripley
capabilities
to see if these devices are
supported by this build of R.
## copy current plot to a PNG file dev.print(png, file="myplot.png", width=480, height=480)