classify_pixels         Classifies the pixels of an image
define_cat              Creates a category object
define_rule             Creates a rule object
define_subcat           Creates a subcategory object
label_rule              Adds a label to the rule
pixelclasser            pixelclasser: Functions to classify pixels by
                        colour
place_rule              Places a line on the rgb plot
plot_pixels             Plot the pixels of a transformed image
plot_rgb_plane          Plots a triangular plot to be filled with
                        pixels and rules
plot_rule               Plots the line that defines a rule
read_image              Imports a jpg or tiff file.
save_classif_image      Saves a classified image in TIFF or JPEG format
