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% File src/library/grDevices/man/dev2bitmap.Rd
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% File src/library/grDevices/man/dev2bitmap.Rd
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% Part of the R package, http://www.R-project.org
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% Part of the R package, http://www.R-project.org
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% Copyright 1995-2012 R Core Team
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% Copyright 1995-2014 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\name{dev2bitmap}
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\name{dev2bitmap}
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\alias{dev2bitmap}
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\alias{dev2bitmap}
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\alias{bitmap}
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\alias{bitmap}
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environment variable \env{GSC} is used, otherwise commands
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environment variable \env{GSC} is used, otherwise commands
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\code{"gswi64c.exe"} then \code{"gswin32c.exe"} are tried.
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\code{"gswi64c.exe"} then \code{"gswin32c.exe"} are tried.
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The types available will depend on the version of \code{ghostscript},
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The types available will depend on the version of \code{ghostscript},
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but are likely to include
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but are likely to include
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\code{"pcxmono"}, \code{"pcxgray"}, \code{"pcx16"}, \code{"pcx256"},
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\code{"pcx24b"}, \code{"pcxcmyk"}, \code{"pbm"}, \code{"pbmraw"},
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\code{"jpeg"}, \code{"jpegcmyk"}, \code{"jpeggray"},
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\code{"pgm"}, \code{"pgmraw"}, \code{"pgnm"}, \code{"pgnmraw"},
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\code{"pnm"}, \code{"pnmraw"}, \code{"ppm"}, \code{"ppmraw"},
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\code{"pkm"}, \code{"pkmraw"}, \code{"tiffcrle"}, \code{"tiffg3"},
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\code{"tiffcrle"}, \code{"tiffg3"},
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\code{"tiffg32d"}, \code{"tiffg4"}, \code{"tifflzw"},
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\code{"tiffg32d"}, \code{"tiffg4"}, \code{"tiffgray"}, \code{"tifflzw"},
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\code{"tiffpack"}, \code{"tiff12nc"}, \code{"tiff24nc"}, \code{"tiff32nc"}
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\code{"tiffpack"}, \code{"tiff12nc"}, \code{"tiff24nc"}, \code{"tiff32nc"}
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\code{"psmono"}, \code{"psgray"}, \code{"psrgb"}, \code{"bit"},
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\code{"png16"}, \code{"png16m"}, \code{"png256"}, \code{"png48"},
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\code{"bitrgb"}, \code{"bitcmyk"}, \code{"pngmono"}, \code{"pnggray"},
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\code{"pngmono"}, \code{"pnggray"}, \code{"pngalpha"},
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\code{"pngalpha"}, \code{"png16"}, \code{"png256"}, \code{"png16m"},
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\code{"bmp16"}, \code{"bmp16m"} \code{"bmp256"}, \code{"bmp32b"},
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\code{"png48"}, \code{"jpeg"}, \code{"jpeggray"}, \code{"pdfwrite"}.
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\code{"bmpgray"}, \code{"bmpmono"}.
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The default type, \code{"png16m"}, supports 24-bit colour and
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The default type, \code{"png16m"}, supports 24-bit colour and
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anti-aliasing. Versions of \R prior to 2.7.0 defaulted to
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\code{"png256"}, which uses a palette of 256 colours and could be a
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anti-aliasing. Type \code{"png256"} uses a palette of 256 colours and
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more compact representation. Monochrome graphs can use
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could give a more compact representation. Monochrome graphs can use
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\code{"pngmono"}, or \code{"pnggray"} if anti-aliasing is desired.
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\code{"pngmono"}, or \code{"pnggray"} if anti-aliasing is desired.
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Plots with a transparent background and varying degrees of
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Plots with a transparent background and varying degrees of
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transparency should use \code{"pngalpha"}.
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transparency should use \code{"pngalpha"}.
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Note that for a colour TIFF image you probably want \code{"tiff24nc"},
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Note that for a colour TIFF image you probably want \code{"tiff24nc"},
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For formats which contain a single image, a file specification like
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For formats which contain a single image, a file specification like
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\code{Rplots\%03d.png} can be used: this is interpreted by Ghostscript.
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\code{Rplots\%03d.png} can be used: this is interpreted by Ghostscript.
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For \code{dev2bitmap} if just one of \code{width} and \code{height} is
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For \code{dev2bitmap} if just one of \code{width} and \code{height} is
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specified, the other is chosen to preserve aspect ratio of the
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specified, the other is chosen to preserve the aspect ratio of the
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device being copied. The main reason to prefer \code{method = "pdf"}
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device being copied. The main reason to prefer \code{method = "pdf"}
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over the default would be to allow semi-transparent colours to be used.
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over the default would be to allow semi-transparent colours to be used.
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For graphics parameters such as \code{"cra"} that need to work in
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For graphics parameters such as \code{"cra"} that need to work in
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pixels, the default resolution of 72dpi is always used.
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pixels, the default resolution of 72dpi is always used.
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