RGB2GRAY: translates an RGB image matrix to gray scale
In iNZightVIT/RgoogleMaps: Overlays on Google map tiles in R

Description Usage Arguments Details Value Author(s) Examples

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

1	RGB2GRAY(myTile)

myTile

rgb image matrix, usually array with 3 dimensions

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

image tile

Markus Loecher

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)


}