246 lines
8.1 KiB
Python
246 lines
8.1 KiB
Python
import numpy as np
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import torch
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import torch.nn.functional as F
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from PIL import Image
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import math
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import fcbh.utils
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class Blend:
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def __init__(self):
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pass
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@classmethod
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def INPUT_TYPES(s):
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return {
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"required": {
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"image1": ("IMAGE",),
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"image2": ("IMAGE",),
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"blend_factor": ("FLOAT", {
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"default": 0.5,
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"min": 0.0,
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"max": 1.0,
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"step": 0.01
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}),
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"blend_mode": (["normal", "multiply", "screen", "overlay", "soft_light"],),
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},
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}
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RETURN_TYPES = ("IMAGE",)
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FUNCTION = "blend_images"
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CATEGORY = "image/postprocessing"
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def blend_images(self, image1: torch.Tensor, image2: torch.Tensor, blend_factor: float, blend_mode: str):
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if image1.shape != image2.shape:
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image2 = image2.permute(0, 3, 1, 2)
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image2 = fcbh.utils.common_upscale(image2, image1.shape[2], image1.shape[1], upscale_method='bicubic', crop='center')
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image2 = image2.permute(0, 2, 3, 1)
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blended_image = self.blend_mode(image1, image2, blend_mode)
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blended_image = image1 * (1 - blend_factor) + blended_image * blend_factor
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blended_image = torch.clamp(blended_image, 0, 1)
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return (blended_image,)
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def blend_mode(self, img1, img2, mode):
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if mode == "normal":
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return img2
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elif mode == "multiply":
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return img1 * img2
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elif mode == "screen":
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return 1 - (1 - img1) * (1 - img2)
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elif mode == "overlay":
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return torch.where(img1 <= 0.5, 2 * img1 * img2, 1 - 2 * (1 - img1) * (1 - img2))
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elif mode == "soft_light":
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return torch.where(img2 <= 0.5, img1 - (1 - 2 * img2) * img1 * (1 - img1), img1 + (2 * img2 - 1) * (self.g(img1) - img1))
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else:
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raise ValueError(f"Unsupported blend mode: {mode}")
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def g(self, x):
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return torch.where(x <= 0.25, ((16 * x - 12) * x + 4) * x, torch.sqrt(x))
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def gaussian_kernel(kernel_size: int, sigma: float, device=None):
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x, y = torch.meshgrid(torch.linspace(-1, 1, kernel_size, device=device), torch.linspace(-1, 1, kernel_size, device=device), indexing="ij")
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d = torch.sqrt(x * x + y * y)
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g = torch.exp(-(d * d) / (2.0 * sigma * sigma))
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return g / g.sum()
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class Blur:
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def __init__(self):
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pass
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@classmethod
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def INPUT_TYPES(s):
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return {
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"required": {
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"image": ("IMAGE",),
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"blur_radius": ("INT", {
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"default": 1,
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"min": 1,
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"max": 31,
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"step": 1
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}),
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"sigma": ("FLOAT", {
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"default": 1.0,
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"min": 0.1,
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"max": 10.0,
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"step": 0.1
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}),
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},
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}
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RETURN_TYPES = ("IMAGE",)
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FUNCTION = "blur"
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CATEGORY = "image/postprocessing"
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def blur(self, image: torch.Tensor, blur_radius: int, sigma: float):
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if blur_radius == 0:
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return (image,)
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batch_size, height, width, channels = image.shape
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kernel_size = blur_radius * 2 + 1
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kernel = gaussian_kernel(kernel_size, sigma, device=image.device).repeat(channels, 1, 1).unsqueeze(1)
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image = image.permute(0, 3, 1, 2) # Torch wants (B, C, H, W) we use (B, H, W, C)
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padded_image = F.pad(image, (blur_radius,blur_radius,blur_radius,blur_radius), 'reflect')
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blurred = F.conv2d(padded_image, kernel, padding=kernel_size // 2, groups=channels)[:,:,blur_radius:-blur_radius, blur_radius:-blur_radius]
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blurred = blurred.permute(0, 2, 3, 1)
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return (blurred,)
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class Quantize:
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def __init__(self):
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pass
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@classmethod
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def INPUT_TYPES(s):
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return {
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"required": {
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"image": ("IMAGE",),
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"colors": ("INT", {
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"default": 256,
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"min": 1,
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"max": 256,
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"step": 1
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}),
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"dither": (["none", "floyd-steinberg"],),
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},
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}
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RETURN_TYPES = ("IMAGE",)
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FUNCTION = "quantize"
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CATEGORY = "image/postprocessing"
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def quantize(self, image: torch.Tensor, colors: int = 256, dither: str = "FLOYDSTEINBERG"):
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batch_size, height, width, _ = image.shape
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result = torch.zeros_like(image)
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dither_option = Image.Dither.FLOYDSTEINBERG if dither == "floyd-steinberg" else Image.Dither.NONE
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for b in range(batch_size):
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tensor_image = image[b]
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img = (tensor_image * 255).to(torch.uint8).numpy()
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pil_image = Image.fromarray(img, mode='RGB')
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palette = pil_image.quantize(colors=colors) # Required as described in https://github.com/python-pillow/Pillow/issues/5836
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quantized_image = pil_image.quantize(colors=colors, palette=palette, dither=dither_option)
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quantized_array = torch.tensor(np.array(quantized_image.convert("RGB"))).float() / 255
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result[b] = quantized_array
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return (result,)
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class Sharpen:
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def __init__(self):
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pass
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@classmethod
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def INPUT_TYPES(s):
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return {
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"required": {
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"image": ("IMAGE",),
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"sharpen_radius": ("INT", {
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"default": 1,
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"min": 1,
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"max": 31,
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"step": 1
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}),
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"sigma": ("FLOAT", {
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"default": 1.0,
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"min": 0.1,
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"max": 10.0,
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"step": 0.1
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}),
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"alpha": ("FLOAT", {
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"default": 1.0,
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"min": 0.0,
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"max": 5.0,
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"step": 0.1
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}),
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},
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}
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RETURN_TYPES = ("IMAGE",)
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FUNCTION = "sharpen"
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CATEGORY = "image/postprocessing"
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def sharpen(self, image: torch.Tensor, sharpen_radius: int, sigma:float, alpha: float):
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if sharpen_radius == 0:
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return (image,)
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batch_size, height, width, channels = image.shape
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kernel_size = sharpen_radius * 2 + 1
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kernel = gaussian_kernel(kernel_size, sigma) * -(alpha*10)
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center = kernel_size // 2
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kernel[center, center] = kernel[center, center] - kernel.sum() + 1.0
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kernel = kernel.repeat(channels, 1, 1).unsqueeze(1)
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tensor_image = image.permute(0, 3, 1, 2) # Torch wants (B, C, H, W) we use (B, H, W, C)
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tensor_image = F.pad(tensor_image, (sharpen_radius,sharpen_radius,sharpen_radius,sharpen_radius), 'reflect')
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sharpened = F.conv2d(tensor_image, kernel, padding=center, groups=channels)[:,:,sharpen_radius:-sharpen_radius, sharpen_radius:-sharpen_radius]
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sharpened = sharpened.permute(0, 2, 3, 1)
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result = torch.clamp(sharpened, 0, 1)
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return (result,)
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class ImageScaleToTotalPixels:
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upscale_methods = ["nearest-exact", "bilinear", "area", "bicubic", "lanczos"]
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crop_methods = ["disabled", "center"]
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@classmethod
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def INPUT_TYPES(s):
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return {"required": { "image": ("IMAGE",), "upscale_method": (s.upscale_methods,),
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"megapixels": ("FLOAT", {"default": 1.0, "min": 0.01, "max": 16.0, "step": 0.01}),
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}}
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RETURN_TYPES = ("IMAGE",)
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FUNCTION = "upscale"
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CATEGORY = "image/upscaling"
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def upscale(self, image, upscale_method, megapixels):
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samples = image.movedim(-1,1)
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total = int(megapixels * 1024 * 1024)
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scale_by = math.sqrt(total / (samples.shape[3] * samples.shape[2]))
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width = round(samples.shape[3] * scale_by)
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height = round(samples.shape[2] * scale_by)
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s = fcbh.utils.common_upscale(samples, width, height, upscale_method, "disabled")
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s = s.movedim(1,-1)
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return (s,)
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NODE_CLASS_MAPPINGS = {
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"ImageBlend": Blend,
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"ImageBlur": Blur,
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"ImageQuantize": Quantize,
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"ImageSharpen": Sharpen,
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"ImageScaleToTotalPixels": ImageScaleToTotalPixels,
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}
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