At some point or another, pretty much everybody has had to bulk process all the images in a directory. Either to resize them to a smaller size to share them, or do some other simple transformation. Well, here is a very easy way to do it with a dozen lines of Python.
# Resize all images in a directory to half the size. # # Save on a new file with the same name but with "small_" prefix # on high quality jpeg format. # # If the script is in /images/ and the files are in /images/2012-1-1-pics # call with: python resize.py 2012-1-1-pics import Image import os import sys directory = sys.argv for file_name in os.listdir(directory): print("Processing %s" % file_name) image = Image.open(os.path.join(directory, file_name)) x,y = image.size new_dimensions = (x/2, y/2) output = image.resize(new_dimensions, Image.ANTIALIAS) output_file_name = os.path.join(directory, "small_" + file_name) output.save(output_file_name, "JPEG", quality = 95) print("All done")