import os
import PIL
from PIL import Image

SHOW_FILES = False  # set to True if you want to see them after creation.
MAX_X = 560
output_format = 'PNG'
path = '/home/zeffii/Desktop/AUTO_RESIZE/gl_fillet/'
os.chdir(path) # set this folder active
mode = 'AA'  #  ('AA', 'NOAA')

# warning: ensure no non images or folders in folder that contains your
# larger images.
filelist = os.listdir(path) 

# make a 'mod' directory
mod_path = path+"mod"
os.mkdir(mod_path)

for file in filelist:
    filepath = path+file
    
    # get name, assume filename is 3 chars long. make new name with "_mod"
    img_name = file[:-4]+"_mod"
    
    # open the file, get dimensions
    db = Image.open(filepath)
    img_x, img_y = db.size

    # resize according to a maximum x width
    NEW_Y = (MAX_X*img_y)/img_x

    if img_x <= MAX_X:
        # if smaller or equal to 560, save file unchanged
        continue
    else:
        # scale the image down to have x width of MAX_X
        if mode == 'AA':
            mod_image = db.resize((MAX_X, NEW_Y), Image.ANTIALIAS)
        if mode == 'NOAA':
            mod_image = db.resize((MAX_X, NEW_Y))

    mod_image.save(mod_path+"/"+img_name+".png", format=output_format)

    if SHOW_FILES:
        mod_image.show()