Python读取图片并保存的几种方式

这里尝试过png和jpg，为方便保存路径在函数内自动转换，因此需要路径后缀恰为三位。

方法一：Pillow

这里采用pillow读取图片，它默认显示图片采用系统的默认图片显示器。

def read_image_1(path):
    """ Pillow
    This will show picture with default image showing program.

    Args:
        path: path of the image.
    """
    image = Image.open(path)
    image.show()
    new_path = path[:-4] + '-fc1.jpg'
    image.save(new_path)

方法二：Matplot

这里用matplot的pyplot去读取和显示图片，注意保存图片需要在显示之前执行，否则无法保存。

def read_image_2(path):
    """ matplot

    Args:
        path: path of the image.
    """
    image = mpimg.imread(path)
    plt.imshow(image)
    plt.axis('off')
    new_path = path[:-4] + '-fc2.jpg'
    mpimg.imsave(new_path, image)
    plt.show()

方法三：OpenCV

这里显示图片需要条用cv2.waitKey()，否则图片会显示后立刻消失。

注意：OpenCV读取的图片的排列方式为bgr而非常见的rgb

def read_image_3(path):
    """ OpenCV

    Args:
        path: path of the image.
    """
    image = cv2.imread(path)
    cv2.imshow(path, image)
    cv2.waitKey()
    new_path = path[:-4] + '-fc3.jpg'
    cv2.imwrite(new_path, image)

方法四：Imageio

这里imageio只是用于读取和保存，用matplot显示。

def read_image_4(path):
    """ imageio

    Args:
        path: path of the image.
    """
    image = imageio.imread(path)
    plt.imshow(image)
    plt.show()
    new_path = path[:-4] + '-fc4.jpg'
    imageio.imsave(new_path, image)

方法五：skimage

def read_image_5(path):
    """ skimage

    Args:
        path: path of the image.
    """
    image = io.imread(path)
    io.imshow(image)
    new_path = path[:-4] + '-fc5.jpg'
    io.imsave(new_path, image)
    io.show()

相关加载库

以防万一不知道import什么，这里列一下需要import的库。

from PIL import Image
from skimage import io
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.image as mpimg
import cv2
import imageio