import os
from PIL import Image

src_path = "/home/maxi/Projekt/wtc.waiswuaschd.de/app/static/img/chapters/source_chapter_1.jpg"
out_dir = "/home/maxi/Projekt/wtc.waiswuaschd.de/app/static/img/chapters"
im = Image.open(src_path).convert("RGBA")

def make_transparent(sub_img):
    sub_img = sub_img.convert("RGBA")
    data = sub_img.getdata()
    new_data = []
    for item in data:
        r, g, b, a = item
        lum = 0.299 * r + 0.587 * g + 0.114 * b
        if lum >= 248:
            new_data.append((r, g, b, 0))
        elif lum <= 200:
            new_data.append((r, g, b, 255))
        else:
            alpha = int(255 * (248 - lum) / (248 - 200))
            new_data.append((r, g, b, alpha))
            
    res = Image.new("RGBA", sub_img.size)
    res.putdata(new_data)
    
    bbox = res.getbbox()
    if bbox:
        px1 = max(0, bbox[0] - 8)
        py1 = max(0, bbox[1] - 8)
        px2 = min(res.width, bbox[2] + 8)
        py2 = min(res.height, bbox[3] + 8)
        res = res.crop((px1, py1, px2, py2))
    return res

final_1 = make_transparent(im)
out_path = os.path.join(out_dir, "chapter_1.png")
final_1.save(out_path, "PNG")
print(f"Saved Chapter 1 -> chapter_1.png ({final_1.width}x{final_1.height})")