Fix matplotlib colormap API for matplotlib 3.9+ compatibility

tampering.py

@@ -247,13 +247,20 @@ def annotate_before_after(orig_img, tamper_meta, box_width=4):
 
 
 def overlay_heatmap_on_image(base_img, heat_2d, alpha=0.55, cmap="hot"):
-    import matplotlib.cm as cm
+    # Use the modern colormap registry (matplotlib >= 3.5),
+    # fall back to the deprecated cm.get_cmap on older versions.
+    try:
+        import matplotlib as mpl
+        cmap_fn = mpl.colormaps[cmap]
+    except (AttributeError, KeyError):
+        import matplotlib.cm as cm
+        cmap_fn = cm.get_cmap(cmap)
     base = base_img.convert("RGBA")
     W, H = base.size
     h = heat_2d.astype(np.float32)
     if h.max() > 0: h = (h - h.min()) / (h.max() - h.min() + 1e-9)
     h_resized = cv2.resize(h, (W, H), interpolation=cv2.INTER_CUBIC)
-    rgba = (cm.get_cmap(cmap)(h_resized) * 255).astype(np.uint8)
+    rgba = (cmap_fn(h_resized) * 255).astype(np.uint8)
     rgba[..., 3] = (h_resized * 255 * alpha).astype(np.uint8)
     overlay = Image.fromarray(rgba, mode="RGBA")
     return Image.alpha_composite(base, overlay).convert("RGB")