Add an experimental node to sharpen latents.

Can be used with LatentApplyOperationCFG for interesting results.

comfy_extras/nodes_latent.py

@@ -221,6 +221,55 @@ def tonemap_reinhard(latent, **kwargs):
             return normalized_latent * new_magnitude
         return (tonemap_reinhard,)
 
+class LatentOperationSharpen:
+    @classmethod
+    def INPUT_TYPES(s):
+        return {"required": {
+                "sharpen_radius": ("INT", {
+                    "default": 9,
+                    "min": 1,
+                    "max": 31,
+                    "step": 1
+                }),
+                "sigma": ("FLOAT", {
+                    "default": 1.0,
+                    "min": 0.1,
+                    "max": 10.0,
+                    "step": 0.1
+                }),
+                "alpha": ("FLOAT", {
+                    "default": 0.1,
+                    "min": 0.0,
+                    "max": 5.0,
+                    "step": 0.01
+                }),
+                              }}
+
+    RETURN_TYPES = ("LATENT_OPERATION",)
+    FUNCTION = "op"
+
+    CATEGORY = "latent/advanced/operations"
+    EXPERIMENTAL = True
+
+    def op(self, sharpen_radius, sigma, alpha):
+        def sharpen(latent, **kwargs):
+            luminance = (torch.linalg.vector_norm(latent, dim=(1)) + 1e-6)[:,None]
+            normalized_latent = latent / luminance
+            channels = latent.shape[1]
+
+            kernel_size = sharpen_radius * 2 + 1
+            kernel = comfy_extras.nodes_post_processing.gaussian_kernel(kernel_size, sigma, device=luminance.device)
+            center = kernel_size // 2
+
+            kernel *= alpha * -10
+            kernel[center, center] = kernel[center, center] - kernel.sum() + 1.0
+
+            padded_image = torch.nn.functional.pad(normalized_latent, (sharpen_radius,sharpen_radius,sharpen_radius,sharpen_radius), 'reflect')
+            sharpened = torch.nn.functional.conv2d(padded_image, kernel.repeat(channels, 1, 1).unsqueeze(1), padding=kernel_size // 2, groups=channels)[:,:,sharpen_radius:-sharpen_radius, sharpen_radius:-sharpen_radius]
+
+            return luminance * sharpened
+        return (sharpen,)
+
 NODE_CLASS_MAPPINGS = {
     "LatentAdd": LatentAdd,
     "LatentSubtract": LatentSubtract,
@@ -231,4 +280,5 @@ def tonemap_reinhard(latent, **kwargs):
     "LatentApplyOperation": LatentApplyOperation,
     "LatentApplyOperationCFG": LatentApplyOperationCFG,
     "LatentOperationTonemapReinhard": LatentOperationTonemapReinhard,
+    "LatentOperationSharpen": LatentOperationSharpen,
 }