png {base}R Documentation

JPEG and PNG graphics devices

Description

A graphics device for JPEG or PNG format bitmap files.

Usage

jpeg(filename="Rplot.jpg", width=480, height=480, pointsize=12, quality=75)
png(filename="Rplot.png", width=480, height=480, pointsize=12)

Arguments

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.

Details

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.

Value

A plot device is opened: nothing is returned to the R interpreter.

Note

These are based on the X11 device, so the additional arguments to that device work, but are rarely appropriate.

Author(s)

Guido Masarotto and Brian Ripley

See Also

Devices, dev.print

Examples

## copy current plot to a PNG file
dev.print(png, file="myplot.png", width=480, height=480)

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