python生成指定尺寸的缩略图，python尺寸缩略图,def MakeThum

python生成指定尺寸的缩略图，python尺寸缩略图,def MakeThum

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)