读取图片
from PIL import Image
with Image.open(filename) as image:
image.show()
修改图片大小：图片不变形
image = image.resize((w, h), Image.ANTIALIAS)
修改图片大小：拉伸、放大缩小
image = image.resize((w, h))
旋转
image = image.rotate(90)
明暗
image = image.point(lambda p: p * 1.3)
保存图片
image.save("test.jpg")
PIL.Image 转numpy.array
img = numpy.array(image)
numpy.array转 PIL.Image
image = Image.fromarray(img.astype('uint8')).convert('RGB')
