| dev2bitmap {base} | R Documentation |
bitmap generates a bitmap graphics file.
dev2bitmap copies the current graphics device to a file in a
bitmap graphics format.
bitmap(file, type = "png256", height = 6, width = 6, res = 72,
pointsize, ...)
dev2bitmap(file, type = "png256", height = 6, width = 6, res = 72,
pointsize, ...)
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. |
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.
For dev2bitmap if just one of width and height is
specified, the other is chosen to preserve aspect ratio of the
device being copied.
None.
B. D. Ripley
postscript, png and
jpeg and on Windows bmp.