JPEG-2000 to JPEG conversion using Python - PIL

convert.py

# Expects jp2 files in folder jp2-files/
# jpeg files are generated in folder jpeg-files/

import os
from PIL import Image, ImageFile
ImageFile.LOAD_TRUNCATED_IMAGES = True

input_folder = "jp2-files"
output_folder = "jpeg-files"

if not os.path.exists(output_folder):
    os.makedirs(output_folder)
if not os.path.exists(input_folder):
    os.makedirs(input_folder)

input_files = os.listdir(input_folder)
ignore = ['.DS_Store']
input_files = list(filter(lambda x: x not in ignore, input_files))

for f in input_files:
    print("Processing:", f)
    im = Image.open(os.path.join(input_folder, f)) # just a path to a JP2 file
    newfile = os.path.join(output_folder, f[:f.rfind(".")]+".jpeg")
    if not os.path.isfile(newfile):
        im.save(newfile)
    else:
        print("Already processed:", f)
    im.close()