Trim images in bulk using opencv to pre-defined dimensions (implemented for grayscale images)

trim.py

import os
import numpy as np
import cv2
from scipy.misc import imsave

DIR = './'
LEFT=190
RIGHT=1246
TOP=0
BOTTOM=590

for file_name in os.listdir(DIR):
	if '.png' not in file_name:
		continue
	img=cv2.imread(DIR+file_name,cv2.IMREAD_GRAYSCALE)
	img=img[TOP:BOTTOM,LEFT:RIGHT]
	imsave('new_'+file_name,img)