renameFilesByShutterAndAperture.py

'''
This is heavily inspired by http://www.leancrew.com/all-this/2013/10/photo-management-via-the-finder/ .
I had to modify the script for some college work at th-koeln.de
'''

import os
import exifread
import subprocess

def slug(str):

	return str.replace(".", "_").replace("/", "_")

def fnumber(str):
	if len(str.printable.split("/")) == 2:
		zaehler, nenner = str.printable.split("/")
		return slug("{:.1f}".format(float(zaehler) / float(nenner)))
	else:
		return str.printable

photos = os.listdir(".") # here
photos = [ x for x in photos if x[-4:] == '.jpg' or x[-4:] == '.JPG' ]
for photo in photos:

	f = open(photo, 'rb')
	tags = exifread.process_file(f)
	exptime = slug(tags["EXIF ExposureTime"].printable)
	fn = fnumber(tags["EXIF FNumber"])

	print photo
	print "ExposureTime: %s" % slug(tags["EXIF ExposureTime"].printable)
	print "FNumber: %s" % fnumber(tags["EXIF FNumber"])

	subprocess.check_output(["convert", photo, "-resize", "400x400", "out/t%s_f%s.jpg" % (exptime, fn)])
	print "Converted"
	print