import os
from PIL import Image, ImageChops

def trim(im):
    bg = Image.new(im.mode, im.size, im.getpixel((0,0)))
    diff = ImageChops.difference(im, bg)
    diff = ImageChops.add(diff, diff, 2.0, -100)
    bbox = diff.getbbox()
    if bbox:
        return im.crop(bbox)

img_types = ['jpg', 'peg', 'bmp', 'png', 'gif']#'peg' in case it says '.jpeg'

for root, dirs, files in os.walk("/imgroot"):#Folder where all images are stored, will walk recursively
	for file in files:
		if file[-3:] in img_types and "cropped" not in file:
			im = Image.open(os.path.join(root, file))
			im = trim(im)
			im.save(os.path.join(root, "cropped_" + file))