This is really more of a reminder for me than anything else.
Convert is a tool from the same stable as Mogrify, and is an absolute life-saver when working with large batches of images.
Just the other day I was using it to crop some 2000 jpegs which were scans of pages from a rather thick book. The odd and even pages were offset, by which I mean that the space on the outside of the page was greater than on the inside, and I wanted to crop the pages so that they looked pretty even.
Not wanting to do this all by hand, I wrote a Python shell script to process the files.
#!/usr/bin/env python3 import subprocess import os import sys path_to_jpegs = "/home/dani/big fat book/pages/" path_to_output = path_to_jpegs + 'cropped/' print('starting...') file_path = path_to_jpegs # loop through all the images in the specified folder for filename in os.listdir(file_path): if ('.jpg' in filename): print('@@@ processing file: ' + path_to_jpegs + filename) # file number is needed in order to determine of the file is an odd or even page dot_pos = filename.find('.') file_number = int(filename[:dot_pos]) # switch coords depending if this file is even or odd # left page if (file_number % 2 == 0): #coords = '1940x2720+966+240' coords = '1940x2720+400+238' # right page else: #coords = '1940x2720+400+238' coords = '1940x2720+966+240' subprocess.call(['convert', '-crop', coords, path_to_jpegs + filename, path_to_output + filename])