Script to crop icon image with size 1024x1024 to 16x16, 32x32, 48x48, and 128x128, and cut the icon to be a rounded square.

icon_cropper.py

from PIL import Image, ImageDraw, ImageOps

corner_radius = 100

def crop_to_circle(image_path, output_path, size):
    original_image = Image.open(image_path)
    square_image = ImageOps.fit(original_image, (1024, 1024), method=0, bleed=0.0, centering=(0.5, 0.5))
    rounded_image = Image.new("RGBA", square_image.size, (255, 255, 255, 0))

    draw = ImageDraw.Draw(rounded_image)
    draw.rounded_rectangle([(0, 0), square_image.size], corner_radius, fill=(255, 255, 255, 255))
    rounded_image.paste(square_image, mask=square_image)
    resized_image = square_image.resize((size, size), Image.DEFAULT_STRATEGY)

    data = resized_image.getdata()
    new_data = []
    for item in data:
        if item[0] == 255 and item[1] == 255 and item[2] == 255:
            new_data.append((255, 255, 255, 0))  # change white color to transparent
        else:
            new_data.append(item)

    resized_image.putdata(new_data)
    resized_image.save(output_path)

sizes = [128, 48, 32, 16]  # <== change the list if you'd like other sizes
for size in sizes:
    output_path = f"icon_{size}.png"
    crop_to_circle("/path/to/your/icon/icon_1024.png", output_path, size)

requirements.txt

Pillow==10.1.0