diff --git a/test_rust.py b/test_rust.py
old mode 100644
new mode 100755
index 34f4839..6e56382
--- a/test_rust.py
+++ b/test_rust.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 from pathlib import Path
 from thermaldecoder import decode
 import numpy as np
diff --git a/thermaldecoder/src/lib.rs b/thermaldecoder/src/lib.rs
index 14a1ce9..de0a407 100644
--- a/thermaldecoder/src/lib.rs
+++ b/thermaldecoder/src/lib.rs
@@ -169,6 +169,7 @@ fn decode_raw(filename: &str, frames_root: &str) -> anyhow::Result<Vec<Vec<u16>>
             .copied()
             .map(|x| {
                 let x: f64 = x.into();
+                let x = x / 256.0;
                 ((-1.665884e-08) * x.powf(4.)
                     + (1.347094e-05) * x.powf(3.)
                     + (-4.396264e-03) * x.powf(2.)