Resizing Images with Python and OpenCV

This article provides a step‑by‑step example of using Python and the OpenCV library to change an image’s size.

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# @Time    : 2021/7/17 下午9:53
# @Author  : huaan

import cv2 as cv

img = cv.imread("one.jpg")
cv.imshow("img", img)
print("原来图片的形状大小：", img.shape)  # shape显示图片大小

resize_img = cv.resize(img, dsize=(400, 460))
cv.imshow("resize_img", resize_img)
cv.imwrite("resize_img.jpg",resize_img)

print("修改后图片形状大小：", resize_img.shape)

# 当只有键盘输入q时，才退出
while True:
    if ord("q")==cv.waitKey(0):
        print("当前输入的是：",cv.waitKey(0),"请用键盘输入：q")
        break

cv.destroyAllWindows()

The script reads an image, shows its original dimensions, resizes it to 400 × 460 pixels, saves the new file, and waits for the user to press “q” before closing all OpenCV windows.

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