pil_notification_icon.py

from PIL import Image
im = Image.open("ic_notify.png")

out = Image.new("RGBA", (96, 96))

pix = out.load()

blank = (0, 0, 0, 0)
white = (255, 255, 255, 255)

for x in range(0, 96):
    for y in range(0, 96):
        p = im.getpixel((x,y))

        if p[0] > 200 and p[1] > 200 and p[2] > 200:
            pix[x, y] = blank
        else:
            pix[x, y] = white

out.save("test.png")