improve auto color scheme performance

dots/.config/quickshell/ii/scripts/colors/scheme_for_image.py

@@ -35,6 +35,16 @@ def pick_scheme(colorfulness):
     else:
         return "scheme-tonal-spot"
 
+def load_and_resize_image(img_path, max_dim=128):
+    img = cv2.imread(img_path)
+    if img is None:
+        return None
+    h, w = img.shape[:2]
+    if max(h, w) > max_dim:
+        scale = max_dim / max(h, w)
+        img = cv2.resize(img, (int(w * scale), int(h * scale)), interpolation=cv2.INTER_AREA)
+    return img
+
 def main():
     colorfulness_mode = False
     args = sys.argv[1:]
@@ -45,7 +55,7 @@ def main():
         print("scheme-tonal-spot")
         sys.exit(1)
     img_path = args[0]
-    img = cv2.imread(img_path)
+    img = load_and_resize_image(img_path)
     if img is None:
         print("scheme-tonal-spot")
         sys.exit(1)