R: Graphics Device for Bitmap Files

dev2bitmap {base}

R Documentation

Graphics Device for Bitmap Files

Description

bitmap generates a bitmap graphics file. dev2bitmap copies the current graphics device to a file in a bitmap 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 recent version of ghostscript (5.10, 5.50 and 6.01 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.

Value

None.

Author(s)

B. D. Ripley