diff --git a/src/sharpedge/frame_image.py b/src/sharpedge/frame_image.py
index 1d90431..4ddf2ac 100644
--- a/src/sharpedge/frame_image.py
+++ b/src/sharpedge/frame_image.py
@@ -33,8 +33,7 @@ def frame_image(img, h_border=20, w_border=20, inside=False, color=0):
     >>> framed_img_rgb = frame_image(img_rgb, h_border=20, w_border=20, inside=False, color=(255, 0, 0))
     """
     # Input validation
-    if not Utility._input_checker(img):
-        return
+    Utility._input_checker(img)
     
     # Warning: when image size is below 3 x 3
     if img.shape[0] < 3 or img.shape[1] < 3:
diff --git a/src/sharpedge/modulate_image.py b/src/sharpedge/modulate_image.py
index 58fd3bf..5ef1425 100644
--- a/src/sharpedge/modulate_image.py
+++ b/src/sharpedge/modulate_image.py
@@ -99,8 +99,7 @@ def modulate_image(img, mode='as-is', ch_swap=None, ch_extract=None):
     
     """
     # Input validation
-    if not Utility._input_checker(img):
-        return
+    Utility._input_checker(img)
     
     # Validate 'mode' input
     if mode not in ['as-is', 'gray', 'rgb']:
diff --git a/src/sharpedge/pca_compression.py b/src/sharpedge/pca_compression.py
index 7867469..048764b 100644
--- a/src/sharpedge/pca_compression.py
+++ b/src/sharpedge/pca_compression.py
@@ -44,8 +44,7 @@ def pca_compression(img, preservation_rate=0.9):
     >>> compressed_img = pca_compression(img)
     """
     # Validate Input
-    if not Utility._input_checker(img):
-        return
+    Utility._input_checker(img)
     if img.ndim != 2:
         raise ValueError("Input image must be a 2D array.")
     if not isinstance(preservation_rate, (int, float)):
diff --git a/src/sharpedge/pooling_image.py b/src/sharpedge/pooling_image.py
index 14f3dde..287c0cb 100644
--- a/src/sharpedge/pooling_image.py
+++ b/src/sharpedge/pooling_image.py
@@ -30,8 +30,7 @@ def pooling_image(img, window_size, pooling_method=np.mean):
     >>> pooled_img = pooling_image(img_rgb, window_size=20, pooling_method=np.max)
     """
     # Input validation
-    if not Utility._input_checker(img):
-        return
+    Utility._input_checker(img)
 
     if not isinstance(window_size, int):
         raise TypeError("window_size must be an integer.")
diff --git a/src/sharpedge/reposition_image.py b/src/sharpedge/reposition_image.py
index aff44c5..4a3a68a 100644
--- a/src/sharpedge/reposition_image.py
+++ b/src/sharpedge/reposition_image.py
@@ -42,8 +42,7 @@ def reposition_image(img, flip='none', rotate='up', shift_x=0, shift_y=0):
     >>> repositioned_img = reposition_image(img_rgb, flip='both', rotate='down', shift_x=-5, shift_y=10)
     """
     # Input validation
-    if not Utility._input_checker(img):
-        return
+    Utility._input_checker(img)
 
     # Validate flip
     valid_flips = ["none", "horizontal", "vertical", "both"]