Python script to resize 4x PNG image to multi density for Android.

android_drawable_resizer.py

import argparse
from PIL import Image
import os

# Create a dictionary to store the multipliers for density suffixes
density_multipliers = {
    '-ldpi': 0.75,
    '-mdpi': 1.0,
    '-hdpi': 1.5,
    '-xhdpi': 2.0,
    '-xxhdpi': 3.0,
    '-xxxhdpi': 4.0
}

# Create an ArgumentParser
parser = argparse.ArgumentParser(description='Resize and rename an image based on scaling factor')

# Add an argument for the image file name
parser.add_argument('image_file', help='Input image file name')

# Parse the command-line arguments
args = parser.parse_args()

# Open the image file
image = Image.open(args.image_file)

# Define the density suffixes
suffixes = list(density_multipliers.keys())

# Create resized images for each density suffix
for suffix in suffixes:
    width, height = image.size
    w = (width / 4) * density_multipliers[suffix]
    h = (height / 4) * density_multipliers[suffix]

    resized_image = image.resize((int(w), int(h)), Image.ANTIALIAS)

    # Construct the new filename with the density suffix
    base_filename, file_extension = os.path.splitext(args.image_file)
    filename_splitted = base_filename.split("/")
    new_name = filename_splitted[-1]

    output_dir_suffix = f'drawable{suffix}'
    output_dir_full = os.path.join(new_name, output_dir_suffix)
    if not os.path.exists(output_dir_full):
        os.makedirs(output_dir_full)
    output_path = os.path.join(output_dir_full, f'{new_name}{file_extension}')

    # Save the resized image with the new filename
    resized_image.save(output_path)

# Close the original image
image.close()
print('Image generated successfully')