在 Python 中将目录中的所有文件（.jpg 到 .png）转换

Question

I'm trying to convert all files from a directory from .jpg to .png. The name should remain the same, just the format would change.

I've been doing some researches and came to this:

from PIL import Image
import os

directory = r'D:\PATH'

for filename in os.listdir(directory):
    if filename.endswith(".jpg"):
        im = Image.open(filename)
        im.save('img11.png')
        print(os.path.join(directory, filename))
        continue
    else:
        continue

I was expecting the loop to go through all my .jpg files and convert them to .png files. So far I was doing only with 1 name: 'img11.png', I haven't succed to build something able to write the adequate names.

The print(os.path.join(directory, filename)) works, it prints all my files but concerning the converting part, it only works for 1 file.

Do you guys have any idea for helping me going through the process?

Answer 1

You can convert the opened image as RGB and then you can save it in any format. You can try the following code :

from PIL import Image
import os

directory = r'D:\PATH'
c=1
for filename in os.listdir(directory):
    if filename.endswith(".jpg"):
        im = Image.open(filename)
        name='img'+str(c)+'.png'
        rgb_im = im.convert('RGB')
        rgb_im.save(name)
        c+=1
        print(os.path.join(directory, filename))
        continue
    else:
        continue

Answer 2

You're explicitly saving every file as img11.png . You should get the name of your jpg file and then use that to name and save the png file.

name = filename[:-4]
im.save(name + '.png')

Answer 3

I would have used os.rename() function like below.

import os 
directory = r'D:\PATH' 
for filename in os.listdir(directory):
    prefix = filename.split(".jpg")[0]
    os.rename(filename, prefix+".png")

Please let me know if this is what you wanted. Try the code with some copied images inside a test folder, before applying to the intended folder. All the best.

Answer 4

from PIL import Image 
import os directory = r'D:\PATH' 
for filename in os.listdir(directory): 
    if filename.endswith(".jpg"): 
        prefix = filename.split(".jpg")[0]
        im = Image.open(filename)
        im.save(prefix+'.png')  
    else: 
        continue

Please try this one and let me know.