adds Blend, Blur, Dither, Sharpen nodes

comfy_extras/nodes_post_processing.py

+import torch
+import torch.nn.functional as F
+
+
+class Blend:
+    def __init__(self):
+        pass
+
+    @classmethod
+    def INPUT_TYPES(s):
+        return {
+            "required": {
+                "image1": ("IMAGE",),
+                "image2": ("IMAGE",),
+                "blend_factor": ("FLOAT", {
+                    "default": 0.5,
+                    "min": 0.0,
+                    "max": 1.0,
+                    "step": 0.01
+                }),
+                "blend_mode": (["normal", "multiply", "screen", "overlay", "soft_light"],),
+            },
+        }
+
+    RETURN_TYPES = ("IMAGE",)
+    FUNCTION = "blend_images"
+
+    CATEGORY = "postprocessing"
+
+    def blend_images(self, image1: torch.Tensor, image2: torch.Tensor, blend_factor: float, blend_mode: str):
+        blended_image = self.blend_mode(image1, image2, blend_mode)
+        blended_image = image1 * (1 - blend_factor) + blended_image * blend_factor
+        blended_image = torch.clamp(blended_image, 0, 1)
+        return (blended_image,)
+
+    def blend_mode(self, img1, img2, mode):
+        if mode == "normal":
+            return img2
+        elif mode == "multiply":
+            return img1 * img2
+        elif mode == "screen":
+            return 1 - (1 - img1) * (1 - img2)
+        elif mode == "overlay":
+            return torch.where(img1 <= 0.5, 2 * img1 * img2, 1 - 2 * (1 - img1) * (1 - img2))
+        elif mode == "soft_light":
+            return torch.where(img2 <= 0.5, img1 - (1 - 2 * img2) * img1 * (1 - img1), img1 + (2 * img2 - 1) * (self.g(img1) - img1))
+        else:
+            raise ValueError(f"Unsupported blend mode: {mode}")
+
+    def g(self, x):
+        return torch.where(x <= 0.25, ((16 * x - 12) * x + 4) * x, torch.sqrt(x))
+
+class Blur:
+    def __init__(self):
+        pass
+
+    @classmethod
+    def INPUT_TYPES(s):
+        return {
+            "required": {
+                "image": ("IMAGE",),
+                "blur_radius": ("INT", {
+                    "default": 1,
+                    "min": 1,
+                    "max": 31,
+                    "step": 1
+                }),
+                "sigma": ("FLOAT", {
+                    "default": 1.0,
+                    "min": 0.1,
+                    "max": 10.0,
+                    "step": 0.1
+                }),
+            },
+        }
+
+    RETURN_TYPES = ("IMAGE",)
+    FUNCTION = "blur"
+
+    CATEGORY = "postprocessing"
+
+    def gaussian_kernel(self, kernel_size: int, sigma: float):
+        x, y = torch.meshgrid(torch.linspace(-1, 1, kernel_size), torch.linspace(-1, 1, kernel_size), indexing="ij")
+        d = torch.sqrt(x * x + y * y)
+        g = torch.exp(-(d * d) / (2.0 * sigma * sigma))
+        return g / g.sum()
+
+    def blur(self, image: torch.Tensor, blur_radius: int, sigma: float):
+        if blur_radius == 0:
+            return (image,)
+
+        batch_size, height, width, channels = image.shape
+
+        kernel_size = blur_radius * 2 + 1
+        kernel = self.gaussian_kernel(kernel_size, sigma).repeat(channels, 1, 1).unsqueeze(1)
+
+        image = image.permute(0, 3, 1, 2) # Torch wants (B, C, H, W) we use (B, H, W, C)
+        blurred = F.conv2d(image, kernel, padding=kernel_size // 2, groups=channels)
+        blurred = blurred.permute(0, 2, 3, 1)
+
+        return (blurred,)
+
+class Dither:
+    def __init__(self):
+        pass
+
+    @classmethod
+    def INPUT_TYPES(s):
+        return {
+            "required": {
+                "image": ("IMAGE",),
+                "bits": ("INT", {
+                    "default": 4,
+                    "min": 1,
+                    "max": 8,
+                    "step": 1
+                }),
+            },
+        }
+
+    RETURN_TYPES = ("IMAGE",)
+    FUNCTION = "dither"
+
+    CATEGORY = "postprocessing"
+
+    def dither(self, image: torch.Tensor, bits: int):
+        batch_size, height, width, _ = image.shape
+        result = torch.zeros_like(image)
+
+        for b in range(batch_size):
+            tensor_image = image[b]
+            img = (tensor_image * 255)
+            height, width, _ = img.shape
+
+            scale = 255 / (2**bits - 1)
+
+            for y in range(height):
+                for x in range(width):
+                    old_pixel = img[y, x].clone()
+                    new_pixel = torch.round(old_pixel / scale) * scale
+                    img[y, x] = new_pixel
+
+                    quant_error = old_pixel - new_pixel
+
+                    if x + 1 < width:
+                        img[y, x + 1] += quant_error * 7 / 16
+                    if y + 1 < height:
+                        if x - 1 >= 0:
+                            img[y + 1, x - 1] += quant_error * 3 / 16
+                        img[y + 1, x] += quant_error * 5 / 16
+                        if x + 1 < width:
+                            img[y + 1, x + 1] += quant_error * 1 / 16
+
+            dithered = img / 255
+            tensor = dithered.unsqueeze(0)
+            result[b] = tensor
+
+        return (result,)
+
+class Sharpen:
+    def __init__(self):
+        pass
+
+    @classmethod
+    def INPUT_TYPES(s):
+        return {
+            "required": {
+                "image": ("IMAGE",),
+                "sharpen_radius": ("INT", {
+                    "default": 1,
+                    "min": 1,
+                    "max": 31,
+                    "step": 1
+                }),
+                "alpha": ("FLOAT", {
+                    "default": 1.0,
+                    "min": 0.1,
+                    "max": 5.0,
+                    "step": 0.1
+                }),
+            },
+        }
+
+    RETURN_TYPES = ("IMAGE",)
+    FUNCTION = "sharpen"
+
+    CATEGORY = "postprocessing"
+
+    def sharpen(self, image: torch.Tensor, sharpen_radius: int, alpha: float):
+        if sharpen_radius == 0:
+            return (image,)
+
+        batch_size, height, width, channels = image.shape
+
+        kernel_size = sharpen_radius * 2 + 1
+        kernel = torch.ones((kernel_size, kernel_size), dtype=torch.float32) * -1
+        center = kernel_size // 2
+        kernel[center, center] = kernel_size**2
+        kernel *= alpha
+        kernel = kernel.repeat(channels, 1, 1).unsqueeze(1)
+
+        tensor_image = image.permute(0, 3, 1, 2) # Torch wants (B, C, H, W) we use (B, H, W, C)
+        sharpened = F.conv2d(tensor_image, kernel, padding=center, groups=channels)
+        sharpened = sharpened.permute(0, 2, 3, 1)
+
+        result = torch.clamp(sharpened, 0, 1)
+
+        return (result,)
+
+NODE_CLASS_MAPPINGS = {
+    "Blend": Blend,
+    "Blur": Blur,
+    "Dither": Dither,
+    "Sharpen": Sharpen,
+}

nodes.py

@@ -1112,4 +1112,5 @@ def load_custom_nodes():
 
 def init_custom_nodes():
     load_custom_nodes()
-    load_custom_node(os.path.join(os.path.join(os.path.dirname(os.path.realpath(__file__)), "comfy_extras"), "nodes_upscale_model.py"))
\ No newline at end of file
+    load_custom_node(os.path.join(os.path.join(os.path.dirname(os.path.realpath(__file__)), "comfy_extras"), "nodes_upscale_model.py"))
+    load_custom_node(os.path.join(os.path.join(os.path.dirname(os.path.realpath(__file__)), "comfy_extras"), "nodes_post_processing.py"))