R: Graphics Device for Bitmap Files via GhostScript

dev2bitmap {graphics}

R Documentation

Graphics Device for Bitmap Files via GhostScript

Description

bitmap generates a graphics file. dev2bitmap copies the current graphics device to a file in a graphics format.

Usage

bitmap(file, type = "png256", height = 6, width = 6, res = 72,
       pointsize, ...)
dev2bitmap(file, type = "png256", height = 6, width = 6, res = 72,
           pointsize, ...)

Arguments

`file`	The output file name, with an appropriate extension.
`type`	The type of bitmap. the default is `"png256"`.
`height`	The plot height, in inches.
`width`	The plot width, in inches.
`res`	Resolution, in dots per inch.
`pointsize`	The pointsize to be used for text: defaults to something reasonable given the width and height
`...`	Other parameters passed to `postscript`.

Details

dev2bitmap works by copying the current device to a postscript device, and post-processing the output file using ghostscript. bitmap works in the same way using a postscript device and postprocessing the output as “printing”.

You will need a version of ghostscript (5.10 and later have been tested): the full path to the executable can be set by the environment variable R_GSCMD.

The types available will depend on the version of ghostscript, but are likely to include "pcxmono", "pcxgray", "pcx16", "pcx256", "pcx24b", "pcxcmyk", "pbm", "pbmraw", "pgm", "pgmraw", "pgnm", "pgnmraw", "pnm", "pnmraw", "ppm", "ppmraw", "pkm", "pkmraw", "tiffcrle", "tiffg3", "tiffg32d", "tiffg4", "tifflzw", "tiffpack", "tiff12nc", "tiff24nc", "psmono", "psgray", "psrgb", "bit", "bitrgb", "bitcmyk", "pngmono", "pnggray", "png16", "png256", "png16m", "jpeg", "jpeggray", "pdfwrite".

Note: despite the name of the functions they can produce PDF via type = "pdfwrite", and the PDF produced is not bitmapped.

For formats which contain a single image, a file specification like Rplots%03d.png can be used: this is interpreted by GhostScript.

For dev2bitmap if just one of width and height is specified, the other is chosen to preserve aspect ratio of the device being copied.

Value