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
工具一：cv2
pip install opencv-python之后就可以
import cv21.1 导包
import osimport cv2import sysimport numpy as np1.2 路径设置
path = r"C:\\Users\\86775\\test_change\\"
path2 = r"C:\\Users\\86775\\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
工具二：pillow
pip install pillow之后就可以
from PIL import Image2.1 导包
import osfrom PIL import Image2.2 路径设置
path = r"C:\\Users\\86775\\test_change\\"
path2 = r"C:\\Users\\86775\\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
）)
