diff --git a/src/diffusers/image_processor.py b/src/diffusers/image_processor.py
index 4f6f4bd52b9c..dcde6f0db249 100644
--- a/src/diffusers/image_processor.py
+++ b/src/diffusers/image_processor.py
@@ -120,8 +120,8 @@ def __init__(
         if do_convert_rgb and do_convert_grayscale:
             raise ValueError(
                 "`do_convert_rgb` and `do_convert_grayscale` can not both be set to `True`,"
-                " if you intended to convert the image into RGB format, please set `do_convert_grayscale = False`.",
-                " if you intended to convert the image into grayscale format, please set `do_convert_rgb = False`",
+                " if you intended to convert the image into RGB format, please set `do_convert_grayscale = False`."
+                " if you intended to convert the image into grayscale format, please set `do_convert_rgb = False`"
             )
 
     @staticmethod
diff --git a/src/diffusers/pipelines/deprecated/spectrogram_diffusion/pipeline_spectrogram_diffusion.py b/src/diffusers/pipelines/deprecated/spectrogram_diffusion/pipeline_spectrogram_diffusion.py
index ead87da95c87..c5a6a6a9e616 100644
--- a/src/diffusers/pipelines/deprecated/spectrogram_diffusion/pipeline_spectrogram_diffusion.py
+++ b/src/diffusers/pipelines/deprecated/spectrogram_diffusion/pipeline_spectrogram_diffusion.py
@@ -249,7 +249,7 @@ def __call__(
             if callback is not None and i % callback_steps == 0:
                 callback(i, full_pred_mel)
 
-            logger.info("Generated segment", i)
+            logger.info("Generated segment %d", i)
 
         if output_type == "np" and not is_onnx_available():
             raise ValueError(
diff --git a/src/diffusers/pipelines/wan/image_processor.py b/src/diffusers/pipelines/wan/image_processor.py
index fa18150fcc6e..0e58ec1beb08 100644
--- a/src/diffusers/pipelines/wan/image_processor.py
+++ b/src/diffusers/pipelines/wan/image_processor.py
@@ -72,8 +72,8 @@ def __init__(
         if do_convert_rgb and do_convert_grayscale:
             raise ValueError(
                 "`do_convert_rgb` and `do_convert_grayscale` can not both be set to `True`,"
-                " if you intended to convert the image into RGB format, please set `do_convert_grayscale = False`.",
-                " if you intended to convert the image into grayscale format, please set `do_convert_rgb = False`",
+                " if you intended to convert the image into RGB format, please set `do_convert_grayscale = False`."
+                " if you intended to convert the image into grayscale format, please set `do_convert_rgb = False`"
             )
 
     def _resize_and_fill(
diff --git a/tests/others/test_image_processor.py b/tests/others/test_image_processor.py
index 88e82ab54b82..bce07a3e7706 100644
--- a/tests/others/test_image_processor.py
+++ b/tests/others/test_image_processor.py
@@ -308,3 +308,16 @@ def test_vae_image_processor_resize_np(self):
         assert out_np.shape == exp_np_shape, (
             f"resized image output shape '{out_np.shape}' didn't match expected shape '{exp_np_shape}'."
         )
+
+    def test_rgb_and_grayscale_conflict_message_is_one_string(self):
+        # The ValueError used to be raised with two arguments, so str(e) rendered the tuple
+        # repr and the second half of the guidance arrived wrapped in quotes and parentheses.
+        with self.assertRaises(ValueError) as ctx:
+            VaeImageProcessor(do_convert_rgb=True, do_convert_grayscale=True)
+
+        assert len(ctx.exception.args) == 1
+        message = str(ctx.exception)
+        assert message.startswith("`do_convert_rgb` and `do_convert_grayscale` can not both be set to `True`,")
+        assert "please set `do_convert_grayscale = False`" in message
+        assert "please set `do_convert_rgb = False`" in message
+        assert not message.startswith("(")