I'm attempting to write a for loop that opens each image in a folder, processes it, and then outputs it back into the same folder. The problem is, when I run the script, nothing happens. I just see the script displayed in the command window. I have tried running each part of the script outside of the loop, and the individual parts seem to be okay. For reference, I have defined the guassian noise image outside of the loop, with the loop adding the guassian noise over the original image. I then want to append a number to the end of the new image name, so the original image is not deleted. img_dir = "path to folder" data_path = os.path.join(img_dir, '*tif') files = glob.glob(data_path) data = [] i = 0 for f1 in files: img = cv2.imread(f1) data.append(img) # Add gaussian noise image to original image gn_img = cv2.add(img, gauss_noise) cv2.imwrite( "{}{}_{:07d}.tif".format( img_dir, f1.split("/")[-1].strip(".tif"), i), gn_img) i += 1 Continue reading...