bitmap2png              Converts a bitmap image to PNG using
clipboard2bitmap        Save clipboard image to temporary BMP file
clipboard_sample        Sample data of clipboard bitmap array
compare_table           Compare values within tow arrays or matrices.
                        Helper function for 'locate_ndl_in_hay()'.
count_val_freq          Helper function for 'compare_table()'.
create_header           Create a BMP header
crop_image              Cut off a part of image from a whole image.
display_corner          Get display corner of screen
display_size            Get the size of the display.
get_clipboard_image     Retrieves the image from the clipboard
get_os                  Get OS name
hex2little_endian       Convert hexadecimal string to little-endian
image2gray_matrix       Convert cimg class into grayscale xy matrix.
                        Helper function for 'locate_image()'. Use
                        grayscale to Speed up and to simplify code.
index2xy                Convert array index into xy location in matrix.
                        Helper function for 'locate_ndl_in_hay()'.
install_screenshot      Install command line screenshot for Windows.
is_all_same             Helper function for 'locate_ndl_in_hay()'.
locate_image            Locate needle image position on a screenshot
                        image.
locate_ndl_in_hay       Locate needle image matrix position in a
                        haystack_image matrix. Helper function for
                        'locate_image()'.
reset_transparent       Reset transparent background of an image
save_bmp                Save an image as a BMP file
save_clipboard_image    Saves an image from the clipboard to a file
screenshot              Take a screenshot.
screenshot_exists       Find screenshot exec file.
xy_pos                  Get xy position of a value in a matrix Helper
                        function for 'locate_ndl_in_hay()'.
