利用tensorflow对jpeg格式图像编码解码操作

import tensorflow as tf
import matplotlib.pyplot as plt
import glob
from skimage import io

image_raw_data=tf.gfile.FastGFile('flower/daisy/5547758_eea9edfd54_n.jpg','rb').read();
with tf.Session() as sess:
    img_data=tf.image.decode_jpeg(image_raw_data);
    print(img_data.eval());
    plt.imshow(img_data.eval());
    plt.show();

    image_data=tf.image.convert_image_dtype(img_data,dtype=tf.uint8);
    print(image_data);
    encoded_image=tf.image.encode_jpeg(image_data);
    with tf.gfile.GFile('path/output.jpg','wb') as f:
        f.write(encoded_image.eval());

    i=tf.gfile.FastGFile('path/output.jpg','rb').read();
    img=tf.image.decode_jpeg(i);
    print(img.eval());