Batch processes png files within a set directory, consolidates the data and exports the data for each image and type
bulk_digitise(dir, types = c("diff", "same"))
the path name to the directory / folder where the files are located
Argument specifying whether the types of images are the same (i.e., all scatter plots - "same") or a mixture of different plot types (i.e., scatter plots, means and se - "diff").
If type = "same" the function returns a dataframe with the relevant data for each figure being digitised. If type = "diff" it returns a list of the relevant data.