如何实现python图片格式转换脚本

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如何实现python图片格式转换脚本

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1.cv2

pip install opencv-python之后就可以import cv2

1.1 导包

importosimportcv2importsysimportnumpyasnp

1.2 路径设置

path=r"C:\\Users\\86775\\PycharmProjects\\pythonProject2\\ResNet\\test_change\\"path3=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)foriinos.listdir(path):print(os.path.splitext(i))#('34474006827920603','.png')ifos.path.splitext(i)[1]==".jpeg":img=cv2.imread(path+i)#print(img)new_imagename=i.replace(".jpeg",".jpg")cv2.imwrite(path3+new_imagename,img)elifos.path.splitext(i)[1]==".png":img=cv2.imread(path+i)#print(img)new_imagename=i.replace(".png",".jpg")cv2.imwrite(path3+new_imagename,img)elifos.path.splitext(i)[1]==".JPG":img=cv2.imread(path+i)#print(img)new_imagename=i.replace(".JPG",".jpg")cv2.imwrite(path3+new_imagename,img)elifos.path.splitext(i)[1]==".PNG":img=cv2.imread(path+i)#print(img)new_imagename=i.replace(".PNG",".jpg")cv2.imwrite(path3+new_imagename,img)elifos.path.splitext(i)[1]==".jpg":img=cv2.imread(path+i)#print(img)cv2.imwrite(path3+i,img)

1.3.2 用split()来判断

images=os.listdir(path)foriinos.listdir(path):print(i.split("."))ifi.split(".")[1]=="jpeg":img=cv2.imread(path+i)#print(img)new_imagename=i.replace(".jpeg",".jpg")cv2.imwrite(path3+new_imagename,img)elifi.split(".")[1]=="png":img=cv2.imread(path+i)#print(img)new_imagename=i.replace(".png",".jpg")cv2.imwrite(path3+new_imagename,img)elifi.split(".")[1]=="JPG":img=cv2.imread(path+i)#print(img)new_imagename=i.replace(".JPG",".jpg")cv2.imwrite(path3+new_imagename,img)elifi.split(".")[1]=="PNG":img=cv2.imread(path+i)#print(img)new_imagename=i.replace(".PNG",".jpg")cv2.imwrite(path3+new_imagename,img)elifi.split(".")[1]=="jpg":img=cv2.imread(path+i)#print(img)cv2.imwrite(path3+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

importosfromPILimportImage

2.2 路径设置

path2=r"C:\\Users\\86775\\PycharmProjects\\pythonProject2\\ResNet\\test_change\\"path3=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

defjpeg2jpg(path_in,path_out):img=Image.open(path_in)img=img.convert("RGB")img.save(path_out,"JPEG",quality=80,optimize=True,progressive=True)defpng2jpg(path_in,path_out):img=Image.open(path_in)img=img.convert("RGB")img.save(path_out,"JPEG",quality=80,optimize=True,progressive=True)defJPG2jpg(path_in,path_out):img=Image.open(path_in)img=img.convert("RGB")img.save(path_out,"JPEG",quality=80,optimize=True,progressive=True)defPNG2jpg(path_in,path_out):img=Image.open(path_in)img=img.convert("RGB")img.save(path_out,"JPEG",quality=80,optimize=True,progressive=True)defjpg2jpg(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(path2)foriinimages:print(i)ifos.path.splitext(i)[1]==".jpeg":source=path2+"\\"+str(i.split(".")[0])+".jpeg"target=path3+"\\"+str(i.split(".")[0])+".jpg"jpeg2jpg(source,target)elifos.path.splitext(i)[1]==".png":source=path2+"\\"+str(i.split(".")[0])+".png"target=path3+"\\"+str(i.split(".")[0])+".jpg"png2jpg(source,target)elifos.path.splitext(i)[1]==".JPG":source=path2+"\\"+str(i.split(".")[0])+".JPG"target=path3+"\\"+str(i.split(".")[0])+".jpg"JPG2jpg(source,target)elifos.path.splitext(i)[1]==".PNG":source=path2+"\\"+str(i.split(".")[0])+".PNG"target=path3+"\\"+str(i.split(".")[0])+".jpg"PNG2jpg(source,target)elifos.path.splitext(i)[1]==".jpg":source=path2+"\\"+str(i.split(".")[0])+".jpg"target=path3+"\\"+str(i.split(".")[0])+".jpg"jpg2jpg(source,target)