tools.py

from PIL import ImageTk, Image
from config import *

def flattenAlpha(img):
    global SCALE
    [img_w, img_h] = img.size
    img = img.resize((int(img_w * SCALE), int(img_h * SCALE)), Image.ANTIALIAS)
    alpha = img.split()[-1]  # Pull off the alpha layer
    ab = alpha.tobytes()  # Original 8-bit alpha

    checked = []  # Create a new array to store the cleaned up alpha layer bytes

    # Walk through all pixels and set them either to 0 for transparent or 255 for opaque fancy pants
    transparent = 50  # change to suit your tolerance for what is and is not transparent

    p = 0
    for pixel in range(0, len(ab)):
        if ab[pixel] < transparent:
            checked.append(0)  # Transparent
        else:
            checked.append(255)  # Opaque
        p += 1

    mask = Image.frombytes('L', img.size, bytes(checked))

    img.putalpha(mask)

    return img