前言

常見的圖像任務(wù)通常需要把照片統(tǒng)一成相同的格式，所以此文章正是為了統(tǒng)一格式而生，常見的主要有cv2和PIL.Image的相關(guān)操作，照片格式是一串?dāng)?shù)字加上后綴名

工具一：cv2

pip install opencv-python

之后就可以

import cv2

1.1 導(dǎo)包

import osimport cv2import sysimport numpy as np

1.2 路徑設(shè)置

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

1.3 改格式重新傳

1.3.1 用os.path.splitext()來判斷

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()來判斷

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 查看結(jié)果

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工具二：pillow

pip install pillow

之后就可以

from PIL import Image

2.1 導(dǎo)包

import osfrom PIL import Image

2.2 路徑設(shè)置

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

2.3 寫格式修改函數(shù)

RGBA意思是紅色，綠色，藍(lán)色，Alpha的色彩空間，Alpha指透明度，而JPG不支持透明度。
所以其他格式不轉(zhuǎn)jpg可以直接保存為.png格式，轉(zhuǎn)jpg就需要丟棄Alpha
img = img.convert(“RGB”)，轉(zhuǎn)換成RGB，保證和jpg格式的通道數(shù)相同，也算一種圖片類型變換的防報(bào)錯(cuò)機(jī)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 開始轉(zhuǎn)換

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 查看結(jié)果

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總結(jié)

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