I have a screenshot of map tile (Mercator EPSG: 3857) with satellite overlay in PNG format. I read the PNG as a raster and georeferenced it in R by setting the corner coordinates using the `raster` package.

However, when I try to plot the raster, I get some kooky colors. And when I export the raster as a GeoTIFF the raster is in grayscale.

How do I display the true colors of the original PNG? And what is happening to the "color values" when I read a PNG with the `raster` package?

Here is the raster:

    class       : RasterLayer 
    band        : 1  (of  3  bands)
    dimensions  : 1280, 2560, 3276800  (nrow, ncol, ncell)
    resolution  : 1, 1  (x, y)
    extent      : 0, 2560, 0, 1280  (xmin, xmax, ymin, ymax)
    coord. ref. : +proj=merc +a=6378137 +b=6378137 +lat_ts=0 +lon_0=0 +x_0=0 +y_0=0 +k=1 +units=m +nadgrids=@null +no_defs 
    data source : C:\Users\me\Documents\traffic\bing\images\mymap.png 
    names       : mymap
    values      : 0, 255  (min, max)