photoresize.py

#
#  This script will resize all images in a directory to the MAXSIZE setting.
#  It will keep the image dimensions proportional to the original image.
#  Tom Swanson  Esri  4/2/2013

from PIL import Image #download from here - http://www.pythonware.com/products/pil/
import os    

#Input Directory
indir = "C:/Temp/PhotoIn"
outdir = "C:/Temp/PhotoOut"
MAXSIZE = 600 # Maximum width or height for your photo

files_in_dir = os.listdir(indir)
for file_in_dir in files_in_dir:

    WIDTHSIZE = MAXSIZE
    HEIGHTSIZE = MAXSIZE


    im = Image.open(indir+"\\"+file_in_dir) # open the input file
    (width, height) = im.size        # get the size of the input image

   
    if width > MAXSIZE or height > MAXSIZE: #only resize if height or width is greater than maxsize
        if width > height:
            HEIGHTSIZE = (MAXSIZE*height)/width
        elif height > width:
            WIDTHSIZE = (MAXSIZE*width)/height
           

    print file_in_dir +" - "+str(width)+" - "+str(height)+" - "+str(WIDTHSIZE)+" - "+str(HEIGHTSIZE)

    im = im.resize((WIDTHSIZE, HEIGHTSIZE), Image.ANTIALIAS)
    
    im.save(outdir+"\\"+file_in_dir, "jpeg", quality = 100)