background_assets.py

'''
background_assets.py

usage:

background_assets.py /path/or/glob/to/files/*.png

a small image manipulation script with hardcoded presets to help my wonderful
girlfriend automate asset creation for her game and teach me about PIL

It requires python3 (which is likely already installed) and pillow (https://pillow.readthedocs.io/en/stable/)

pillow can be installed using pip: "pip3 install pillow"

pip can be installed using this guide: https://pip.pypa.io/en/stable/installing/
'''
from pathlib import Path
from PIL import Image, ImageFilter, ImageEnhance
import sys
import os

def blur(path,r=0xae,g=0x86,b=0xf0,t=0.23,rad=2.0):
    '''
    takes the following arguments (defaults are middle blur):
    
    path of the file
    red, green, blue arguments for the tint
    the transparency percentage
    the radius of the gaussian blur
    '''
    img = Image.open(path)
    img = img.convert("RGBA")
    datas = img.getdata()

    newData = []
    for item in datas:
        if item[3] > 0:
            newData.append((r, g, b, int(255 * t)))
        else:
            newData.append((r, g, b, 0))

    img.putdata(newData)

    img2 = Image.open(path)
    img2 = img2.convert("RGBA")

    out = Image.alpha_composite(img2, img)

    out = out.filter(ImageFilter.GaussianBlur(radius = rad))

    return out


if __name__ == '__main__':
    '''
    hardcoded presets
    '''
    blur_args = (0xae,0x86,0xf0,0.23,2.0)
    dblur_args = (0xe5,0xd2,0xd7,0.42,4.3)

    Path("./middleblur").mkdir(parents=True, exist_ok=True)
    Path("./deepblur").mkdir(parents=True, exist_ok=True)

    for input_image_path in sys.argv[1:]:

        root, ext = os.path.splitext(os.path.basename(input_image_path))
        mb_image_path = './middleblur/'+root+'_Blur'+ext
        db_image_path = './deepblur/'+root+'_DBlur'+ext

        print('middle blurring "{}"'.format(input_image_path))
        blur(input_image_path,*blur_args).save(mb_image_path, 'PNG')

        print('deep blurring "{}"'.format(input_image_path))
        blur(input_image_path,*dblur_args).save(db_image_path, 'PNG')