def luminosite(image):
    lum = 0
    pix = image.load()
    x,y = image.size
    for i in range(x) :
        for j in range(y) :
            lum += pix[i,j]
    return lum / (x*y)

def analyse(folder,dark):
    files = [f for f in sorted(glob.glob(folder + "**/*.TIFF", recursive=True))]
    Lum=[]
    for f in files:
        imgf=filtre(f,dark)
        l = luminosite(imgf)
        Lum.append(l)
    return Lum

def filtre(image, dark) :
    img = Image.open(image)
    dark = Image.open(dark)
    img_filtre=img.load()-dark.load()
    return img_filtre