[SOLVED] How to save png copies of ppm images in Python

How to save png copies of ppm images in Python

I have a folder full of ppm images and I want to save png copies of them.

How do I do that?

I've tried executing the following code but nothing happens.

import cv2
import numpy as np
import glob
import sys
import os.path

from os.path import isfile,join 
from PIL import Image

target_path = '/Users/lfw/test'
trg = os.listdir(target_path)
count = 0
 for i in trg:
  fullpath = os.path.join(target_path ,i)
  if os.path.isfile(fullpath): 
  im = Image.open(fullpath)
  im.save(str(count) + 'output.png')
  count = count + 1

Solution

Let's say you have on your desktop a root folder called test containing my_script.py and a subfolder called input where all the ppm files are stored.

You can use the following code to save a png copy of every ppm image.

my_script.py

import os 
import cv2 
from glob import glob 

cwd = os.getcwd()
input_dir = os.path.join(cwd, "input\\*.ppm")    
ppms = glob(input_dir)   

counter = 1 

for ppm in ppms: 
    cv2.imwrite(str(counter)+".png", cv2.imread(ppm))
    counter += 1

NOTE: I've written the code in a particular way that let's you mantain the old ppm files and creates brand new png copies of the original images. If you want to actually replace the ppms with pngs I can edit the answer making it doing the desired job.