add invert function

scripts/Tiling_script.py

@@ -12,8 +12,10 @@
 shape = img.shape
 #Get the chunk size
 chunk_size = 512
+#invert the image if neccessary
+img = np.invert(img)
 #crop the image and save each chunk
 for i in range(0, shape[0], chunk_size):
     for j in range(0, shape[1], chunk_size):
         chunk = img[i:i+chunk_size, j:j+chunk_size]
-        tiff.imsave("{}/chunk_{}_{}.tif".format(image_outdir,i, j), chunk)
+        tiff.imsave("{}/chunk_{}_{}.tif".format(image_outdir,i, j), chunk)