Update preprocessor_config.json

preprocessor_config.json

@@ -8,7 +8,7 @@
   "resample": 2,
   "rescale_factor": 0.00392156862745098,
   "size": {
-    "height": 1024,
-    "width": 1024
+    "height": 384,
+    "width": 384
   }
 }