Resizing using Wand

.gitignore

.*.swp
resized-*.jpg
resized-*.png

README.rst

Resizing using Wand

This small manual is a draft of advanced resizing manual to be included to official Wand docs.

landscape-500x333.png

landscape-942x612.jpg

portrait-378x483.png

portrait-500x632.jpg

requirements.txt

Wand >= 0.2.0

resize.py

from __future__ import division

from wand.image import Image


def resize(image, (width, height), filter='triangle'):
    portrait = image.width < image.height
    if portrait:
        image_size = image.size
        keywords = 'top', 'left', 'height', 'width'
    else:
        image_size = image.height, image.width
        keywords = 'left', 'top', 'width', 'height'
    crop_size = int(image_size[0] * height / width)
    args = (int((image_size[1] - crop_size) / 2), 0, crop_size, image_size[0])
    image.crop(**dict(zip(keywords, args)))
    image.resize(width, height, filter)


if __name__ == '__main__':
    files = [
        'portrait-378x483.png',
        'portrait-500x632.jpg',
        'landscape-500x333.png',
        'landscape-942x612.jpg'
    ]

    for filename in files:
        with open(filename) as image_file:
            with Image(file=image_file) as image:
                resize(image, (400, 400), 'lanczos')
                image.save(filename='resized-' + filename)