RGB function

Create a Red-Green-Blue Raster object

Make a Red-Green-Blue object that can be used to create images. methods

## S4 method for signature 'RasterLayer'
RGB(x, filename='', col=rainbow(25), breaks=NULL, alpha=FALSE, 
                colNA='white', zlim=NULL, zlimcol=NULL, ext=NULL, ...)

Returns

RasterBrick

Arguments

• x: RasterLayer
• filename: character. Output filename (optional)
• col: A color palette, that is a vector of n contiguous colors generated by functions like rainbow , heat.colors , topo.colors , bpy.colors or one or your own making, perhaps using colorRampPalette. If none is provided, rev(terrain.colors(255)) is used unless x has a 'color table'
• breaks: numeric. A set of finite numeric breakpoints for the colours: must have one more breakpoint than colour and be in increasing order
• alpha: If TRUE a fourth layer to set the background transparency is added
• colNA: color for the background (NA values)
• zlim: vector of lenght 2. Range of values to plot
• zlimcol: If NULL the values outside the range of zlim get the color of the extremes of the range. If zlimcol has any other value, the values outside the zlim range get the color of NA values (see colNA)
• ext: An Extent object to zoom in to a region of interest (see drawExtent)
• ...: additional arguments as for writeRaster

See Also

plotRGB

Examples

r <- raster(system.file("external/test.grd", package="raster"))
x <- RGB(r)
plot(x, col=gray(0:9/10))
plotRGB(x)