python圖片格式轉換腳本
發(fā)布日期：2022-02-02 00:02 | 文章來源：腳本之家
常見的圖像任務通常需要把照片統一成相同的格式，所以此文章正是為了統一格式而生，常見的主要有cv2和PIL.Image的相關操作，照片格式是一串數字加上后綴名
1.cv2
pip install opencv-python之后就可以import cv2
1.1 導包
import os import cv2 import sys import numpy as np
1.2 路徑設置
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 查看結果
2.pillow
pip install pillow之后就可以from PIL import Image
2.1 導包
import os from PIL import Image
2.2 路徑設置
path1 = r"C:\\Users\\86775\\PycharmProjects\\pythonProject2\\ResNet\\test_change\\" path2 = r"C:\\Users\\86775\\PycharmProjects\\pythonProject2\\ResNet\\test_change2\\"
2.3 寫格式修改函數
RGBA意思是紅色，綠色，藍色，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jpg可以直接保存為.png格式，轉jpg就需要丟棄Alpha
img = img.convert(“RGB”)，轉換成RGB，保證和jpg格式的通道數相同，也算一種圖片類型變換的防報錯機制
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 查看結果
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