resize images intelligently

image_resize.py

from PIL import Image

def smart_resize(filepath = "samp.png", width = 612, height = 612):


  img = Image.open(image_file)

  orig_height, orig_width = img.size

  if orig_height >= orig_width:
    f = float(width) / float(orig_width)
  else:
    f = float(height) / float(orig_height)


  new_img = img.resize((int(orig_height*f), int(orig_width*f)), Image.ANTIALIAS)

  new_height, new_width = new_img.size

  width_delta = (new_width - width)/2
  height_delta = (new_height - height)/2

  dim = (
     0 + height_delta, 
     0 + width_delta, 
     new_height - height_delta,
     new_width - width_delta
  )

  final_img = new_img.crop(dim)

  final_img.save('reisze-%' % filepath)