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% File src/library/grDevices/man/gray.Rd
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% File src/library/grDevices/man/gray.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 1995-2007 R Core Team
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% Copyright 1995-2012 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{gray}
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\name{gray}
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\alias{gray}
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\alias{gray}
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\alias{grey}
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\alias{grey}
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\title{Gray Level Specification}
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\title{Gray Level Specification}
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\description{
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\description{
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  Create a vector of colors from a vector of gray levels.
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  Create a vector of colors from a vector of gray levels.
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}
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}
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\usage{
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\usage{
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gray(level)
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gray(level, alpha = NULL)
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grey(level)
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grey(level, alpha = NULL)
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}
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}
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\arguments{
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\arguments{
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  \item{level}{a vector of desired gray levels between \code{0} and
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  \item{level}{a vector of desired gray levels between \code{0} and
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    \code{1}; zero indicates \code{"black"} and one indicates
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    \code{1}; zero indicates \code{"black"} and one indicates
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    \code{"white"}.}
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    \code{"white"}.}
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  \item{alpha}{the opacity, if specified.}
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}
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}
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\details{
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\details{
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  The values returned by \code{gray} can be used with a \code{col=}
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  The values returned by \code{gray} can be used with a \code{col=}
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  specification in graphics functions or in \code{\link{par}}.
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  specification in graphics functions or in \code{\link{par}}.
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