Python 3.7 Script for Generating Mac ICNS File from PNG Logo

gistfile1.txt

from PIL import Image  
import os

logo_path = '/path/to/logo.png'

resize_sizes = [
    {
        "file_name": "icon_16x16.png",
        "size": (16, 16)
    },
    {
        "file_name": "icon_16x16@2x.png",
        "size": (32, 32)
    },
    {
        "file_name": "icon_32x32.png",
        "size": (32, 32)
    },
    {
        "file_name": "icon_32x32@2x.png",
        "size": (64, 64)
    },
    {
        "file_name": "icon_64x64.png",
        "size": (64, 64)
    },
    {
        "file_name": "icon_64x64@2x.png",
        "size": (128, 128)
    },
    {
        "file_name": "icon_128x128.png",
        "size": (128, 128)
    },
    {
        "file_name": "icon_128x128@2x.png",
        "size": (256, 256)
    },
    {
        "file_name": "icon_256x256.png",
        "size": (256, 256)
    },
    {
        "file_name": "icon_256x256@2x.png",
        "size": (512, 512)
    },
    {
        "file_name": "icon_512x512.png",
        "size": (512, 512)
    },
    {
        "file_name": "icon_512x512@2x.png",
        "size": (1024, 1024)
    }
]

for item in resize_sizes:

    print('Processing: ' + item['file_name'])
    image = Image.open(logo_path)
    image = image.resize(item['size'], Image.ANTIALIAS)

    if not os.path.exists(os.path.join(os.path.dirname(logo_path), 'icon.iconset')):
        os.mkdir(os.path.join(os.path.dirname(logo_path), 'icon.iconset'))

    image = image.save(os.path.join(os.path.join(os.path.dirname(logo_path), 'icon.iconset'), item['file_name']), quality=100) 

os.system(f"iconutil -c icns {os.path.join(os.path.dirname(logo_path), 'icon.iconset')} {os.path.join(os.path.dirname(logo_path), 'icon.icns')}")
os.system(f"open {os.path.dirname(logo_path)}")
print(f"Find ICNS File at {os.path.join(os.path.dirname(logo_path), 'icon.icns')}")