diff --git a/presidio-image-redactor/presidio_image_redactor/dicom_image_redactor_engine.py b/presidio-image-redactor/presidio_image_redactor/dicom_image_redactor_engine.py
index 5d7ef7208..89c6ea1a8 100644
--- a/presidio-image-redactor/presidio_image_redactor/dicom_image_redactor_engine.py
+++ b/presidio-image-redactor/presidio_image_redactor/dicom_image_redactor_engine.py
@@ -338,9 +338,8 @@ def _rescale_dcm_pixel_array(
             image_2d_scaled = image_2d_float
         else:
             # Rescaling grey scale between 0-255
-            image_2d_scaled = (
-                np.maximum(image_2d_float, 0) / image_2d_float.max()
-            ) * 255.0
+            image_2d_scaled = ((image_2d_float.max() - image_2d_float) / (
+                    image_2d_float.max() - image_2d_float.min())) * 255.0
 
         # Convert to uint
         image_2d_scaled = np.uint8(image_2d_scaled)