collage_grid: Adds a grid to show the parts of the image to be replaced by...
In ThinkRstat/collage: Image collage

Adds a grid to show the parts of the image to be replaced by tiles

1	collage_grid(img, size = 10, grid_col = "white")

`img`	image
`size`	pixel size
`grid_col`	color to use for the grid

## Not run: 
  img <- image_read( sample_image() )

  # a grid of 10x10 tiles
  collage_grid( img, size = 10, grid_col = "white" )

  # a grid with 10 lines
  collage_grid( img, size = lines_cut(img, 10) )

  # a grid with 10 columns
  collage_grid( img, size = columns_cut(img, 10) )

## End(Not run)