| % File src/library/grDevices/man/gray.Rd |
| % Part of the R package, https://www.R-project.org |
| % Copyright 1995-2012 R Core Team |
| % Distributed under GPL 2 or later |
| |
| \name{gray} |
| \alias{gray} |
| \alias{grey} |
| \title{Gray Level Specification} |
| \description{ |
| Create a vector of colors from a vector of gray levels. |
| } |
| \usage{ |
| gray(level, alpha = NULL) |
| grey(level, alpha = NULL) |
| } |
| \arguments{ |
| \item{level}{a vector of desired gray levels between \code{0} and |
| \code{1}; zero indicates \code{"black"} and one indicates |
| \code{"white"}.} |
| \item{alpha}{the opacity, if specified.} |
| } |
| \details{ |
| The values returned by \code{gray} can be used with a \code{col=} |
| specification in graphics functions or in \code{\link{par}}. |
| |
| \code{grey} is an alias for \code{gray}. |
| } |
| \value{ |
| A vector of colors of the same length as \code{level}. |
| } |
| \seealso{ |
| \code{\link{rainbow}}, |
| \code{\link{hsv}}, |
| \code{\link{hcl}}, |
| \code{\link{rgb}}. |
| } |
| \examples{ |
| gray(0:8 / 8) |
| } |
| \keyword{color} |