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@smileboywtu smileboywtu/cuter.py forked from sigilioso/cuter.py
Created May 11, 2017

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Python PIL Example: get a thumbnail by resizing and cropping an image.
# -*- coding: utf-8 -*-
import Image
def resize_and_crop(img_path, modified_path, size, crop_type='top'):
"""
Resize and crop an image to fit the specified size.
args:
img_path: path for the image to resize.
modified_path: path to store the modified image.
size: `(width, height)` tuple.
crop_type: can be 'top', 'middle' or 'bottom', depending on this
value, the image will cropped getting the 'top/left', 'midle' or
'bottom/rigth' of the image to fit the size.
raises:
Exception: if can not open the file in img_path of there is problems
to save the image.
ValueError: if an invalid `crop_type` is provided.
"""
# If height is higher we resize vertically, if not we resize horizontally
img = Image.open(img_path)
# Get current and desired ratio for the images
img_ratio = img.size[0] / float(img.size[1])
ratio = size[0] / float(size[1])
#The image is scaled/cropped vertically or horizontally depending on the ratio
if ratio > img_ratio:
img = img.resize((size[0], size[0] * img.size[1] / img.size[0]),
Image.ANTIALIAS)
# Crop in the top, middle or bottom
if crop_type == 'top':
box = (0, 0, img.size[0], size[1])
elif crop_type == 'middle':
box = (0, (img.size[1] - size[1]) / 2, img.size[0], (img.size[1] + size[1]) / 2)
elif crop_type == 'bottom':
box = (0, img.size[1] - size[1], img.size[0], img.size[1])
else :
raise ValueError('ERROR: invalid value for crop_type')
img = img.crop(box)
elif ratio < img_ratio:
img = img.resize((size[1] * img.size[0] / img.size[1], size[1]),
Image.ANTIALIAS)
# Crop in the top, middle or bottom
if crop_type == 'top':
box = (0, 0, size[0], img.size[1])
elif crop_type == 'middle':
box = ((img.size[0] - size[0]) / 2, 0, (img.size[0] + size[0]) / 2, img.size[1])
elif crop_type == 'bottom':
box = (img.size[0] - size[0], 0, img.size[0], img.size[1])
else :
raise ValueError('ERROR: invalid value for crop_type')
img = img.crop(box)
else :
img = img.resize((size[0], size[1]),
Image.ANTIALIAS)
# If the scale is the same, we do not need to crop
img.save(modified_path)
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