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Python PIL Example: get a thumbnail by resizing and cropping an image.
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# -*- 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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