R: translates an RGB image matrix to gray scale

RGB2GRAY {RgoogleMaps} | R Documentation

## translates an RGB image matrix to gray scale

### Description

This function translates the rgb values of the array myTile into a scalar matrix with just one gray value per pixel.

### Usage

    RGB2GRAY(myTile)

### Arguments

`myTile` | rgb image matrix, usually array with 3 dimensions

### Details

Gray scale intensity defined as 0.30R + 0.59G + 0.11B

### Value

image tile

### Author(s)

Markus Loecher

### Examples

    if (interactive()){
      BrooklynLatLon = getGeoCode("Brooklyn")
      mapBrooklyn <- GetMap(center=BrooklynLatLon, destfile = file.path(tempdir(), "Brooklyn.png"),
                     zoom=11, size = c(240,240))
      mapBrooklynBW$myTile = RGB2GRAY(mapBrooklyn$myTile)
      PlotOnStaticMap(mapBrooklynBW)
    }

[Package RgoogleMaps version 1.4.1 Index]