def MakeThumb(path, sizes=(75, 32, 16)):     """     缩略图生成程序 by Neil Chen     sizes 参数传递要生成的尺寸，可以生成多种尺寸     """     base, ext = os.path.splitext(path)     try:         im = Image.open(path)     except IOError:         return     mode = im.mode     if mode not in ('L', 'RGB'):         if mode == 'RGBA':             # 透明图片需要加白色底             alpha = im.split()[3]             bgmask = alpha.point(lambda x: 255-x)             im = im.convert('RGB')             # paste(color, box, mask)             im.paste((255,255,255), None, bgmask)         else:             im = im.convert('RGB')     width, height = im.size     if width == height:         region = im     else:         if width > height:             delta = (width - height)/2             box = (delta, 0, delta+height, height)         else:             delta = (height - width)/2             box = (0, delta, width, delta+width)         region = im.crop(box)     for size in sizes:         filename = base + "_" + "%sx%s" % (str(size), str(size)) + ".jpg"         thumb = region.resize((size,size), Image.ANTIALIAS)         thumb.save(filename, quality=100) # 默认 JPEG 保存质量是 75, 不太清楚。可选值(0~100)