Tiny Python script that resizes the images in all subfolders to a target size and converts it to PNG format.

ImgToPng.py

# This script is used for resizing and converting images in a specified directory. It traverses through the directory, 
# and for each image file it finds (with extensions .png, .jpg, .jpeg, .bmp, .gif, .tiff, .tif), it resizes the image 
# to a target size (default is 1024x1024) and converts it to PNG format.


from PIL import Image
import os

def resize_and_convert_images(root_dir, target_size=(1024, 1024)):
    for root, dirs, files in os.walk(root_dir):
        for file in files:
            if file.lower().endswith(('.png', '.jpg', '.jpeg', '.bmp', '.gif', '.tiff', '.tif')):
                try:
                    # Construct the full file path
                    file_path = os.path.join(root, file)
                    # Open the image
                    img = Image.open(file_path)

                    # Preserve alpha channel if present
                    if img.mode in ('RGBA', 'LA') or (img.mode == 'P' and 'transparency' in img.info):
                        # Convert to RGBA to preserve transparency
                        img = img.convert('RGBA')
                        new_img = Image.new("RGBA", target_size, (255, 255, 255, 0))
                        img.thumbnail(target_size, Image.Resampling.LANCZOS)  # Updated resampling filter
                        new_img.paste(img, (int((target_size[0] - img.size[0]) / 2), int((target_size[1] - img.size[1]) / 2)))
                    else:
                        # Resize without preserving transparency, using updated resampling filter
                        img = img.resize(target_size, Image.Resampling.LANCZOS)

                    # Construct the new file name and path
                    new_file_name = os.path.splitext(file)[0] + "_lowres.png"
                    new_file_path = os.path.join(root, new_file_name)
                    # Save the resized image as a PNG file
                    img.save(new_file_path, "PNG")
                    print(f"Processed and saved: {new_file_path}")

                    # Delete the original file
                    os.remove(file_path)
                    print(f"Deleted original file: {file_path}")
                except Exception as e:
                    print(f"Error processing {file_path}: {e}")

if __name__ == "__main__":
    # Replace '/path/to/your/folder' with the path to the folder you want to process
    # root_dir = '/path/to/your/folder'

    # Or run it on the script location folder
    root_dir = os.getcwd()
    resize_and_convert_images(root_dir)