python图片格式转换脚本

前言

常见的图像任务通常需要把照片统一成相同的格式，所以此文章正是为了统一格式而生，常见的主要有cv2和PIL.Image的相关操作，照片格式是一串数字加上后缀名

1.cv2

pip install opencv-python之后就可以import cv2

1.1 导包

import osimport cv2import sysimport numpy as np

1.2 路径设置

path = r\"C:\\\\Users\\\\86775\\\\PycharmProjects\\\\pythonProject2\\\\ResNet\\\\test_change\\\\\"path2 = r\"C:\\\\Users\\\\86775\\\\PycharmProjects\\\\pythonProject2\\\\ResNet\\\\test_change2\\\\\"

1.3 改格式重新传

1.3.1 用os.path.splitext()来判断

images = os.listdir(path)for i in os.listdir(path):print(os.path.splitext(i))  # (\'34474006827920603\', \'.png\')if os.path.splitext(i)[1] == \".jpeg\":img = cv2.imread(path + i)# print(img)new_imagename = i.replace(\".jpeg\", \".jpg\")cv2.imwrite(path2 + new_imagename, img)elif os.path.splitext(i)[1] == \".png\":img = cv2.imread(path + i)# print(img)new_imagename = i.replace(\".png\", \".jpg\")cv2.imwrite(path2 + new_imagename, img)elif os.path.splitext(i)[1] == \".JPG\":img = cv2.imread(path + i)# print(img)new_imagename = i.replace(\".JPG\", \".jpg\")cv2.imwrite(path2 + new_imagename, img)elif os.path.splitext(i)[1] == \".PNG\":img = cv2.imread(path + i)# print(img)new_imagename = i.replace(\".PNG\", \".jpg\")cv2.imwrite(path2 + new_imagename, img)elif os.path.splitext(i)[1] == \".jpg\":img = cv2.imread(path + i)# print(img)cv2.imwrite(path2 + i, img)

1.3.2 用split()来判断

images = os.listdir(path)for i in os.listdir(path):print(i.split(\".\"))if i.split(\".\")[1] == \"jpeg\":img = cv2.imread(path + i)# print(img)new_imagename = i.replace(\".jpeg\", \".jpg\")cv2.imwrite(path2 + new_imagename, img)elif i.split(\".\")[1] == \"png\":img = cv2.imread(path + i)# print(img)new_imagename = i.replace(\".png\", \".jpg\")cv2.imwrite(path2 + new_imagename, img)elif i.split(\".\")[1] == \"JPG\":img = cv2.imread(path + i)# print(img)new_imagename = i.replace(\".JPG\", \".jpg\")cv2.imwrite(path2 + new_imagename, img)elif i.split(\".\")[1] == \"PNG\":img = cv2.imread(path + i)# print(img)new_imagename = i.replace(\".PNG\", \".jpg\")cv2.imwrite(path2 + new_imagename, img)elif i.split(\".\")[1] == \"jpg\":img = cv2.imread(path + i)# print(img)cv2.imwrite(path2 + i, img)

1.4 查看结果

2.pillow

pip install pillow之后就可以from PIL import Image

2.1 导包

import osfrom PIL import Image

2.2 路径设置

path1 = r\"C:\\\\Users\\\\86775\\\\PycharmProjects\\\\pythonProject2\\\\ResNet\\\\test_change\\\\\"path2 = r\"C:\\\\Users\\\\86775\\\\PycharmProjects\\\\pythonProject2\\\\ResNet\\\\test_change2\\\\\"

2.3 写格式修改函数

RGBA意思是红色，绿色，蓝色，Alpha的色彩空间，Alpha指透明度，而JPG不支持透明度。
所以其他格式不转jpg可以直接保存为.png格式，转jpg就需要丢弃Alpha
img = img.convert(“RGB”)，转换成RGB，保证和jpg格式的通道数相同，也算一种图片类型变换的防报错机制

def jpeg2jpg(path_in, path_out):img = Image.open(path_in)img = img.convert(\"RGB\")img.save(path_out, \"JPEG\", quality=80, optimize=True, progressive=True)def png2jpg(path_in, path_out):img = Image.open(path_in)img = img.convert(\"RGB\")img.save(path_out, \"JPEG\", quality=80, optimize=True, progressive=True)def JPG2jpg(path_in, path_out):img = Image.open(path_in)img = img.convert(\"RGB\")img.save(path_out, \"JPEG\", quality=80, optimize=True, progressive=True)def PNG2jpg(path_in, path_out):img = Image.open(path_in)img = img.convert(\"RGB\")img.save(path_out, \"JPEG\", quality=80, optimize=True, progressive=True)def jpg2jpg(path_in, path_out):img = Image.open(path_in)img = img.convert(\"RGB\")img.save(path_out, \"JPEG\", quality=80, optimize=True, progressive=True)

2.4 开始转换

images = os.listdir(path1)for i in images:print(i)if os.path.splitext(i)[1] == \".jpeg\":source = path1 + \"\\\\\" + str(i.split(\".\")[0]) + \".jpeg\"target = path2 + \"\\\\\" + str(i.split(\".\")[0]) + \".jpg\"jpeg2jpg(source, target)elif os.path.splitext(i)[1] == \".png\":source = path1 + \"\\\\\" + str(i.split(\".\")[0]) + \".png\"target = path2 + \"\\\\\" + str(i.split(\".\")[0]) + \".jpg\"png2jpg(source, target)elif os.path.splitext(i)[1] == \".JPG\":source = path1 + \"\\\\\" + str(i.split(\".\")[0]) + \".JPG\"target = path2 + \"\\\\\" + str(i.split(\".\")[0]) + \".jpg\"JPG2jpg(source, target)elif os.path.splitext(i)[1] == \".PNG\":source = path1 + \"\\\\\" + str(i.split(\".\")[0]) + \".PNG\"target = path2 + \"\\\\\" + str(i.split(\".\")[0]) + \".jpg\"PNG2jpg(source, target)elif os.path.splitext(i)[1] == \".jpg\":source = path1 + \"\\\\\" + str(i.split(\".\")[0]) + \".jpg\"target = path2 + \"\\\\\" + str(i.split(\".\")[0]) + \".jpg\"jpg2jpg(source, target)

2.5 查看结果

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目录

前言