python图片格式转换脚本
目录[*]前言
[*]1.cv2
[*]1.1 导包
[*]1.2 路径设置
[*]1.3 改格式重新传
[*]1.4 查看结果
[*]2.pillow
[*]2.1 导包
[*]2.2 路径设置
[*]2.3 写格式修改函数
[*]2.4 开始转换
[*]2.5 查看结果
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 os
import cv2
import sys
import 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) == ".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) == ".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) == ".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) == ".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) == ".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(".") == "jpeg":
img = cv2.imread(path + i)
# print(img)
new_imagename = i.replace(".jpeg", ".jpg")
cv2.imwrite(path2 + new_imagename, img)
elif i.split(".") == "png":
img = cv2.imread(path + i)
# print(img)
new_imagename = i.replace(".png", ".jpg")
cv2.imwrite(path2 + new_imagename, img)
elif i.split(".") == "JPG":
img = cv2.imread(path + i)
# print(img)
new_imagename = i.replace(".JPG", ".jpg")
cv2.imwrite(path2 + new_imagename, img)
elif i.split(".") == "PNG":
img = cv2.imread(path + i)
# print(img)
new_imagename = i.replace(".PNG", ".jpg")
cv2.imwrite(path2 + new_imagename, img)
elif i.split(".") == "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 os
from 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) == ".jpeg":
source = path1 + "\\" + str(i.split(".")) + ".jpeg"
target = path2 + "\\" + str(i.split(".")) + ".jpg"
jpeg2jpg(source, target)
elif os.path.splitext(i) == ".png":
source = path1 + "\\" + str(i.split(".")) + ".png"
target = path2 + "\\" + str(i.split(".")) + ".jpg"
png2jpg(source, target)
elif os.path.splitext(i) == ".JPG":
source = path1 + "\\" + str(i.split(".")) + ".JPG"
target = path2 + "\\" + str(i.split(".")) + ".jpg"
JPG2jpg(source, target)
elif os.path.splitext(i) == ".PNG":
source = path1 + "\\" + str(i.split(".")) + ".PNG"
target = path2 + "\\" + str(i.split(".")) + ".jpg"
PNG2jpg(source, target)
elif os.path.splitext(i) == ".jpg":
source = path1 + "\\" + str(i.split(".")) + ".jpg"
target = path2 + "\\" + str(i.split(".")) + ".jpg"
jpg2jpg(source, target)
2.5 查看结果
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