I want to make a map in R that appear old (yellowish and stained). For example:
Is it possible to achieve this effect entirely within R rather than bringing a map into an image processing program such as Illustrator or Photoshop?
Following @gisnside comment, I produced an "old paper look" image in Gimp (following this tutorial from this thread). Then I added it as a PNG image inside R (using readPNG from library
png and rasterImage from
graphics). Then all I had to do was draw over the image.
Below is the map produced (still needing some adjustments, but you get the idea).