Function that make cropped thumbnail from given Image

croppedthumbnail.py

def croppedthumbnail(image, width, height, method=None):
    '''
    Function that make a thumbnail with given size
    but crop image to fit in aspect ratio
    image must be a instance of PIL.Image
    '''
    dst_width  = int(width)
    dst_height = int(height)

    src_width, src_height = image.size
    src_ratio  = float(src_width) / float(src_height)
    dst_ratio = float(dst_width) / float(dst_height)

    if dst_ratio < src_ratio:
        crop_height = src_height
        crop_width = crop_height * dst_ratio
        x_offset = float(src_width - crop_width) / 2
        y_offset = 0
    else:
        crop_width = src_width
        crop_height = crop_width / dst_ratio
        x_offset = 0
        y_offset = float(src_height - crop_height) / 3

    image = image.crop((int(x_offset), int(y_offset), int(x_offset+crop_width), int(y_offset+crop_height)))
    image = image.resize((dst_width, dst_height), method)

    return image