diff --git a/errors.py b/errors.py
new file mode 100644
index 0000000..2f98184
--- /dev/null
+++ b/errors.py
@@ -0,0 +1,7 @@
+class ModelNotFound(Exception):
+    def __init__(self, model_name, *args, **kwargs):
+        super().__init__(
+            f"The model {model_name} could not be found, make sure to download it using ComfyManager first.\nrepository: https://github.com/ltdrdata/ComfyUI-Manager",
+            *args,
+            **kwargs,
+        )
diff --git a/nodes/deep_bump.py b/nodes/deep_bump.py
index 82639f1..c1d54bb 100644
--- a/nodes/deep_bump.py
+++ b/nodes/deep_bump.py
@@ -1,7 +1,6 @@
 import tempfile
 from pathlib import Path
 
-import folder_paths
 import numpy as np
 import onnxruntime as ort
 import torch
diff --git a/nodes/faceenhance.py b/nodes/faceenhance.py
index dcb1e06..c308525 100644
--- a/nodes/faceenhance.py
+++ b/nodes/faceenhance.py
@@ -8,7 +8,6 @@ import cv2
 import folder_paths
 import numpy as np
 import torch
-from basicsr.utils import imwrite
 from comfy import model_management
 from gfpgan import GFPGANer
 from PIL import Image
@@ -247,16 +246,16 @@ class RestoreFace:
         ):
             face_id = idx + 1
             file = self.get_step_image_path("cropped_faces", face_id)
-            imwrite(cropped_face, file)
+            cv2.imwrite(file, cropped_face)
 
             file = self.get_step_image_path("cropped_faces_restored", face_id)
-            imwrite(restored_face, file)
+            cv2.imwrite(file, restored_face)
 
             file = self.get_step_image_path("cropped_faces_compare", face_id)
 
             # save comparison image
             cmp_img = np.concatenate((cropped_face, restored_face), axis=1)
-            imwrite(cmp_img, file)
+            cv2.imwrite(file, cmp_img)
 
 
 __nodes__ = [RestoreFace, LoadFaceEnhanceModel]
diff --git a/nodes/image_processing.py b/nodes/image_processing.py
index 29ac47e..3853a44 100644
--- a/nodes/image_processing.py
+++ b/nodes/image_processing.py
@@ -22,6 +22,18 @@ from ..utils import pil2tensor, tensor2np, tensor2pil
 #     log.warning("cv2.ximgproc.guidedFilter not found, use opencv-contrib-python")
 
 
+def gaussian_kernel(kernel_size: int, sigma_x: float, sigma_y: float, device=None):
+    x, y = torch.meshgrid(
+        torch.linspace(-1, 1, kernel_size, device=device),
+        torch.linspace(-1, 1, kernel_size, device=device),
+        indexing="ij",
+    )
+    d_x = x * x / (2.0 * sigma_x * sigma_x)
+    d_y = y * y / (2.0 * sigma_y * sigma_y)
+    g = torch.exp(-(d_x + d_y))
+    return g / g.sum()
+
+
 class ColorCorrect:
     """Various color correction methods"""
 
@@ -273,6 +285,78 @@ class Blur_:
         return (torch.from_numpy(image),)
 
 
+class Sharpen_:
+    """Sharpens an image using a Gaussian kernel."""
+
+    @classmethod
+    def INPUT_TYPES(cls):
+        return {
+            "required": {
+                "image": ("IMAGE",),
+                "sharpen_radius": (
+                    "INT",
+                    {"default": 1, "min": 1, "max": 31, "step": 1},
+                ),
+                "sigma_x": (
+                    "FLOAT",
+                    {"default": 1.0, "min": 0.1, "max": 10.0, "step": 0.1},
+                ),
+                "sigma_y": (
+                    "FLOAT",
+                    {"default": 1.0, "min": 0.1, "max": 10.0, "step": 0.1},
+                ),
+                "alpha": (
+                    "FLOAT",
+                    {"default": 1.0, "min": 0.0, "max": 5.0, "step": 0.1},
+                ),
+            },
+        }
+
+    RETURN_TYPES = ("IMAGE",)
+    FUNCTION = "do_sharp"
+    CATEGORY = "mtb/image processing"
+
+    def do_sharp(
+        self,
+        image: torch.Tensor,
+        sharpen_radius: int,
+        sigma_x: float,
+        sigma_y: float,
+        alpha: float,
+    ):
+        if sharpen_radius == 0:
+            return (image,)
+
+        channels = image.shape[3]
+
+        kernel_size = 2 * sharpen_radius + 1
+        kernel = gaussian_kernel(kernel_size, sigma_x, sigma_y) * -(alpha * 10)
+
+        # Modify center of kernel to make it a sharpening kernel
+        center = kernel_size // 2
+        kernel[center, center] = kernel[center, center] - kernel.sum() + 1.0
+
+        kernel = kernel.repeat(channels, 1, 1).unsqueeze(1)
+        tensor_image = image.permute(0, 3, 1, 2)
+
+        tensor_image = F.pad(
+            tensor_image,
+            (sharpen_radius, sharpen_radius, sharpen_radius, sharpen_radius),
+            "reflect",
+        )
+        sharpened = F.conv2d(tensor_image, kernel, padding=center, groups=channels)
+
+        # Remove padding
+        sharpened = sharpened[
+            :, :, sharpen_radius:-sharpen_radius, sharpen_radius:-sharpen_radius
+        ]
+
+        sharpened = sharpened.permute(0, 2, 3, 1)
+        result = torch.clamp(sharpened, 0, 1)
+
+        return (result,)
+
+
 # https://github.com/lllyasviel/AdverseCleaner/blob/main/clean.py
 # def deglaze_np_img(np_img):
 #     y = np_img.copy()
@@ -702,4 +786,5 @@ __nodes__ = [
     ImageResizeFactor,
     SaveImageGrid_,
     LoadImageFromUrl_,
+    Sharpen_,
 ]