Table of Contents
Python jpg to png and resize
Dependencies
Code
Python batch converts jpg images to png images
Home Backend Development Python Tutorial What is the method to quickly convert jpg to png and resize it in Python?

What is the method to quickly convert jpg to png and resize it in Python?

May 27, 2023 pm 01:30 PM
python

    Python jpg to png and resize

    A very simple small program that can directly convert all .jpg in this folder to .png format. and customize the size.

    Dependencies

    Need to install pillow library:

    pip install pillow
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    Code

    # -*- coding:utf-8 -*-
    
    # file name: jpg2png.py
    
    import os
    from PIL import Image
    
    list = os.listdir()
    
    for i in list:
        if i != 'jpg2png.py':
            print(i)
            Image.open(i).convert('RGBA').resize((512, 512)).save(i[:i.find('.')] + '.png')
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    Pay attention to the file name, and the size needs to be bracketed.

    Disadvantages

    • Cannot go to white background

    Python batch converts jpg images to png images

    # Convert python image format jpg to png (batch processing, unchanged size)

    import os
    import PIL.Image as Image
    def changeJpgToPng(srcPath, dstPath):
        # 修改图像大小
        image = Image.open(srcPath)
    
        # 将jpg转换为png
        png_name = str(dstPath)[0:-len('.jpg')] + '.png'
        # image.save(png_name)
        # print(png_name)
    
        # image = image.convert('RGBA')
        image = image.convert('RGB')
        image.save(png_name)
        pass
     if __name__ == '__main__':
        listPath = 'D:/BYLW666/deeplabv3-plus-pytorch-main/VOCdevkit/VOC2007/jpg/'#jpg图片
        srcPath = 'D:/BYLW666/deeplabv3-plus-pytorch-main/VOCdevkit/VOC2007/src/'#jpg图片
        dstPath = 'D:/BYLW666/deeplabv3-plus-pytorch-main/VOCdevkit/VOC2007/png/'#png图片
        print("开始转换...")
        filename_list = os.listdir(listPath)
        for d in filename_list:
            if d.count('.jpg') > 0:
                changeJpgToPng(srcPath + d, dstPath + d)
            pass
        print("完成了...")
    
    二、视频转图像或图像转视频
    import cv2
    import os
    
    
    def video2image():
        cap = cv2.VideoCapture("video/01.mp4")
        count = 1
        while True:
            success, frame = cap.read()
            if success == False:
                break
            cv2.imwrite("images/%d.jpg" % count, frame)
            count += 1
    
    
    def image2video():
        # 得到图像路径
        files = os.listdir("images/")
        # 对图像排序
        files.sort(key=lambda x: int(x.split(".")[0]))
        # 获取图像宽高
        h, w, _ = cv2.imread("images/" + files[0]).shape
        # 设置帧数
        fps = 30
    
        vid = []
        '''
        设置要保存的格式
        mp4:
            mp4v 
        avi:
            xvid
            i420
        '''
    
        # 保存视频路径和名称
        # save_path = "video/video.mp4"		# 保存视频路径和名称 MP4格式
        save_path = "video/video.avi"  # 保存视频路径和名称 av格式
    
        # 准备写入视频
        vid = cv2.VideoWriter(save_path, cv2.VideoWriter_fourcc(*'mp4v'), fps, (w, h))
        # vid = cv2.VideoWriter(save_path, cv2.VideoWriter_fourcc(*'xvid'), fps, (w, h))
        # vid = cv2.VideoWriter(save_path, cv2.VideoWriter_fourcc(*'i420'), fps, (w, h))
    
        # 写入
        for file in files:
            img = cv2.imread("images/" + file)
            vid.write(img)
    
    
    if __name__ == '__main__':
        print("start...")
        video2image()
        #image2video()
        print("OK!")
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