def do_tint(img, tint):

    if not tint or tint is 'None':
        return

    if img.mode != "RGBA":
        img = img.convert("RGBA")

    try:
        tint_red = float(int("0x%s" % tint[0:2], 16)) / 255.0
    except ValueError:
        tint_red = 1.0

    try:
        tint_green = float(int("0x%s" % tint[2:4], 16)) / 255.0
    except ValueError:
        tint_green = 1.0

    try:
        tint_blue = float(int("0x%s" % tint[4:6], 16)) / 255.0
    except ValueError:
        tint_blue = 1.0

    try:
        tint_alpha = float(int("0x%s" % tint[6:8], 16)) / 255.0
    except ValueError:
        tint_alpha = 1.0

    try:
        intensity = float(int("0x%s" % tint[8:10], 16))
    except ValueError:
        intensity = 255.0

    if intensity > 0.0 and (tint_red != 1.0 or tint_green != 1.0 or tint_blue != 1.0 or tint_alpha != 1.0):
        # Only tint if the color provided is not ffffffff, because that equals no tint

        pixels = img.load()
        if intensity == 255.0:
            for y in range(img.size[1]):
                for x in range(img.size[0]):
                    data = pixels[x, y]
                    pixels[x, y] = (
                        int(float(data[0]) * tint_red),
                        int(float(data[1]) * tint_green),
                        int(float(data[2]) * tint_blue),
                        int(float(data[3]) - tint_alpha),
                    )
        else:
            intensity = intensity / 255.0
            intensity_inv = 1 - intensity
            tint_red *= intensity
            tint_green *= intensity
            tint_blue *= intensity
            tint_alpha *= intensity
            for y in range(img.size[1]):
                for x in range(img.size[0]):
                    data = pixels[x, y]
                    pixels[x, y] = (
                        int(float(data[0]) * intensity_inv + float(data[0]) * tint_red),
                        int(float(data[1]) * intensity_inv + float(data[1]) * tint_green),
                        int(float(data[2]) * intensity_inv + float(data[2]) * tint_blue),
                        int(float(data[3]) * intensity_inv + float(data[3]) * tint_alpha),
                    )
dataset/ETHPy150Open francescortiz/image/image/utils.py/do_tint/operator `*` -> `-`