python生成指定尺寸缩略图的示例
python生成指定尺寸的缩略图
复制代码 代码如下:
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)