55 lines
3.3 KiB
Markdown
55 lines
3.3 KiB
Markdown
# ComfyUI YSC HighRes-Fix
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A custom node for **[ComfyUI](https://github.com/comfyanonymous/ComfyUI)** designed to simplify the "High-Resolution Fix" process. This node takes an input image, performs a direct upscale, and then re-encodes it into a latent image, preparing it for a final sampling pass to add details.
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## What It Does
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This node replicates the functionality of a high-resolution fix pipeline. Instead of just resizing an image, it upscales it and then uses a diffusion sampling process (denoising) to add fine details that are consistent with the original image's content.
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## How It Works
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The node's operation is straightforward:
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1. **Image Input:** You provide a low-resolution image (e.g., the output of your initial generation).
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2. **Brute Upscale:** The node applies a simple, direct upscale to the image to increase its dimensions.
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3. **Latent Encoding:** This larger, upscaled image is then encoded back into the latent space.
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4. **Image sampling**: This latent image will be denoised by a ksampler-like method, generating a greater and better image.
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5. **Latent Output:** The node outputs this new, larger latent image.
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## How to Use (Example Workflow)
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1. Generate your initial image (e.g., 512x512) as you normally would.
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2. Connect the output image from your `VAE Decode` node to the `image` input of the **YSC HighRes-Fix** node.
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3. Connect the model, VAE, positive and negative prompt and a upscale model to the respective input of **YSC HighRes-Fix** node.
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4. **Crucially, set the `denoise` on this second `KSampler` to a value like `0.3` to `0.55`.** This value controls how much detail is added. **I recommend do not use high values (0.7+) because the image will be broken.**
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5. Adjust the upscale range (1 to 4x upscale). **For low VRAM users, I recommend upscaling up to 2 times using this node.**
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6. Connect the `LATENT` output of this node to a final `VAE Decode` node to get your high-resolution image.
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7. **Optional**: After generating your upscaled image, you can increase even more the resolution using **[Ultimate SD Upscale](https://github.com/ssitu/ComfyUI_UltimateSDUpscale)**
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## Inputs
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* `image`: The source image (from a `VAE Decode` or `Load Image` node) that you want to upscale and refine.
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* `checkpoint model`: A checkpoint used to generate images. This one will be used by the embedded ksampler of the node.
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* `positive and negative prompts`: For quality handling
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* `VAE`: For the embedded VAE encoder of the node.
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* `Upscale model`: Used to make the first raw upscale.
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## Outputs
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* `LATENT`: The upscaled and encoded latent image, ready for a VAE decode.
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## Installation
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1. Navigate to your `ComfyUI/custom_nodes/` directory.
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2. Clone this repository:
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```bash
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git clone https://github.com/yannickcruz/ComfyUI-YSC-HighResFix.git
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```
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(Replace the URL with your actual repository URL)
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3. Alternatively, download the `.py` files from this repository and place them directly in the `ComfyUI/custom_nodes/` directory.
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4. Restart **[ComfyUI](https://github.com/comfyanonymous/ComfyUI)**.
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## Credits
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* This node was possible thanks to the code of the [TheBill2001's](https://github.com/TheBill2001) [comfyui-upscale-by-model](https://github.com/TheBill2001/comfyui-upscale-by-model/tree/main), that inspired me to build the first raw upscale of this node.
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