python使用PIL实现多张图片垂直合并

# coding: utf-8 # image_merge.py # 图片垂直合并 # http://www.redicecn.com # redice@163.com  import os import Image  def image_resize(img, size=(1500, 1100)):   """调整图片大小   """   try:     if img.mode not in ('L', 'RGB'):       img = img.convert('RGB')     img = img.resize(size)   except Exception, e:     pass   return img  def image_merge(images, output_dir='output', output_name='merge.jpg', /         restriction_max_width=None, restriction_max_height=None):   """垂直合并多张图片   images - 要合并的图片路径列表   ouput_dir - 输出路径   output_name - 输出文件名   restriction_max_width - 限制合并后的图片最大宽度，如果超过将等比缩小   restriction_max_height - 限制合并后的图片最大高度，如果超过将等比缩小   """   max_width = 0   total_height = 0   # 计算合成后图片的宽度（以最宽的为准）和高度   for img_path in images:     if os.path.exists(img_path):       img = Image.open(img_path)       width, height = img.size       if width > max_width:         max_width = width       total_height += height    # 产生一张空白图   new_img = Image.new('RGB', (max_width, total_height), 255)   # 合并   x = y = 0   for img_path in images:     if os.path.exists(img_path):       img = Image.open(img_path)       width, height = img.size       new_img.paste(img, (x, y))       y += height    if restriction_max_width and max_width >= restriction_max_width:     # 如果宽带超过限制     # 等比例缩小     ratio = restriction_max_height / float(max_width)     max_width = restriction_max_width     total_height = int(total_height * ratio)     new_img = image_resize(new_img, size=(max_width, total_height))    if restriction_max_height and total_height >= restriction_max_height:     # 如果高度超过限制     # 等比例缩小     ratio = restriction_max_height / float(total_height)     max_width = int(max_width * ratio)     total_height = restriction_max_height     new_img = image_resize(new_img, size=(max_width, total_height))      if not os.path.exists(output_dir):     os.makedirs(output_dir)   save_path = '%s/%s' % (output_dir, output_name)   new_img.save(save_path)   return save_path    if __name__ == '__main__':   image_merge(images=['900-000-000-0501a_b.jpg', '900-000-000-0501b_b.JPG', '1216005237382a_b.jpg'])