script using imageMagic to resize only the images that are bigger than 1460x841

resize.py

import os
from subprocess import call

import time
from datetime import datetime
import calendar

import re

##
## Library
##
def tell(array_of_strings):
    print "###############"
    if not isinstance(array_of_strings, basestring):
        for string in array_of_strings:
            print "###############"+string
    else:
        print "###############"+array_of_strings
    print "###############"
def cmd(array):
    print '==>'+(' '.join(array))
    call(array)


##
## Process
##
def rename_folders(folderpath):
    tell("Renaming folders in "+folderpath)
    for dirname, dirnames, filenames in os.walk(folderpath):
        for subdirname in dirnames:
            new_subdir = subdirname.replace(' ', '_')
            new_subdir = new_subdir.replace('-', '_')
            cmd(['mv', os.path.join(dirname, subdirname), os.path.join(dirname, new_subdir)]) 

def resize(folderpath):
    i = 0
    for dirname, dirnames, filenames in os.walk(folderpath):
        tell("resizing images")
        #Getting the images and check for their date
        for filename in filenames:
            if re.search(".+\.png$", filename, re.IGNORECASE):
                i += 1
                newName = os.path.join(dirname, str(i)+'temp.png')#.replace(' ', '\ ')
                oldname = os.path.join(dirname, filename)#.replace(' ', '\ ')
                cmd(["convert", oldname, '-resize', '1460x841>', newName])
                cmd(["rm", oldname])
                cmd(["mv", newName, oldname])


##
## Main
##
#timestamp
def main(folder):
    rename_folders(folder)
    resize(folder)

##
## First call
##
main('./tuto_2_opti')
main('./tuto_3_opti')
main('./tuto_4_opti')
main('./tuto_5_opti')