from PIL import Image
import numpy as np
import os

for fname in os.listdir("."):
    if fname.endswith(".tiff"):
        im=Image.open(fname)
        arr=np.array(im,dtype=np.uint16)
        maxval = np.max(arr[arr>0])
        minval = np.min(arr[arr>0])
        arr=arr-minval

        arrf = np.array(arr,dtype=np.float)
        arrf = np.array(np.round(255.0*arrf/(maxval-minval)),dtype=np.uint8)

        im8 = Image.fromarray(arrf)
        im8 = im8.resize([500,500])
        im8.save(fname.strip(".tiff")+".jpg")