如何快速将JPG图片转为PNG格式并调整尺寸？
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本文共计640个文字，预计阅读时间需要3分钟。
pythonPython jpg转png并调整大小的小程序直接将文件夹下所有.jpg转为.png，并可以自定义大小import osfrom PIL import Image
def convert_jpg_to_png(folder_path, size=None): for filename in os.listdir(folder_path): if filename.endswith(.jpg): img_path=os.path.join(folder_path, filename) img=Image.open(img_path) if size: img=img.resize(size) new_filename=filename[:-4] + .png new_img_path=os.path.join(folder_path, new_filename) img.save(new_img_path)
使用示例folder_path=path_to_your_folder # 替换为你的文件夹路径convert_jpg_to_png(folder_path, (800, 600)) # 调整为800x600大小
很简单的小程序，可以直接将本文件夹下所有 .jpg 转为 .png 格式，并自定义大小。
依赖需要安装 pillow 库：
pip install pillow代码
# -*- 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')
注意本文件名，还有调整大小需要括号起来。
缺点
不能去白底
# python图片格式jpg转换为png(批量处理,尺寸不变)
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!")
本文共计640个文字，预计阅读时间需要3分钟。
pythonPython jpg转png并调整大小的小程序直接将文件夹下所有.jpg转为.png，并可以自定义大小import osfrom PIL import Image
def convert_jpg_to_png(folder_path, size=None): for filename in os.listdir(folder_path): if filename.endswith(.jpg): img_path=os.path.join(folder_path, filename) img=Image.open(img_path) if size: img=img.resize(size) new_filename=filename[:-4] + .png new_img_path=os.path.join(folder_path, new_filename) img.save(new_img_path)
使用示例folder_path=path_to_your_folder # 替换为你的文件夹路径convert_jpg_to_png(folder_path, (800, 600)) # 调整为800x600大小
很简单的小程序，可以直接将本文件夹下所有 .jpg 转为 .png 格式，并自定义大小。
依赖需要安装 pillow 库：
pip install pillow代码
# -*- 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')
注意本文件名，还有调整大小需要括号起来。
缺点
不能去白底
# python图片格式jpg转换为png(批量处理,尺寸不变)
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!")