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balavec/cuter.py

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Created October 15, 2015 15:45
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  1. @sigilioso sigilioso created this gist Jun 19, 2012.
    57 changes: 57 additions & 0 deletions cuter.py
    View file
    Original file line number Diff line number Diff line change
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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)