Enhance Image Quality with ComfyUI's UpScale AI

Table of Contents

1. Introduction
2. Downloading the AI Angel Mix Checkpoint
3. testing the Model with ComfyUI
4. Generating High-Quality Images
5. Upscaling the Image
   1. Method 1: Upscaling the Latent Directly
   2. Method 2: Upscaling the Image Using an Upscale Model
   3. Method 3: Upscaling Using the Custom Node
6. Conclusion

Upscaling Images with ComfyUI

In this Tutorial, we will explore how to upscale images using ComfyUI and its various methods. We will begin by downloading the AI Angel Mix checkpoint and testing it in ComfyUI. Then, we will dive into the three different methods of upscaling images.

1. Introduction

Welcome to this episode of the ComfyUI tutorial! In this episode, we will focus on upscaling images using ComfyUI and its powerful features. Upscaling can help us enhance the quality and resolution of our images, resulting in stunning and detailed visuals.

2. Downloading the AI Angel Mix Checkpoint

To begin, we need to download the AI Angel Mix checkpoint from Civitai. This checkpoint model will serve as our example throughout this tutorial. Follow the steps below to download the checkpoint:

1. Go to the CivitAI website and locate the AI Angel Mix checkpoint.
2. Click on the download button and save the file in the designated folder (e.g., "ComfyUI Windows Portable").
3. The download may take some time as the file size is approximately 2 gigabytes.

3. Testing the Model with ComfyUI

Once the checkpoint model is downloaded and saved in the appropriate folder, we can test it in ComfyUI. Follow the steps below to get started:

1. Launch ComfyUI and load the default workflow.
2. Change the checkpoint model to "AI Angel Mix - Version 3" in the settings.
3. Test the model by queuing a Prompt and generating an image.
4. Adjust the Height and other parameters as desired.
5. Experiment with using positive and negative prompts for better image results.

4. Generating High-Quality Images

To generate high-quality images, we can further enhance our prompts and utilize additional resources. Consider the following tips:

• Include high-quality photorealistic prompts in both positive and negative prompts.
• Utilize the NSFW prompt for more diverse image generation.
• Experiment with different seeds and fixed steps to achieve desired outcomes.
• Explore various samplers and schedulers to find the best settings for your model.

5. Upscaling the Image

To upscale the image and improve its resolution and quality, we will explore three different methods in ComfyUI.

5.1 Method 1: Upscaling the Latent Directly

The first method involves upscaling the latent directly. Follow these steps:

1. Use the "Latent Upscale By" function to specify the desired size or multiplier.
2. Choose from different upscale methods, such as "nearest exact," to achieve your desired results.
3. Decode the upscaled latent using the VAE Decode function for visualization and further processing.

Please note that denoising the upscaled latent is crucial for optimal results. Use a K-Sampler and denoise the image to remove noise and improve overall quality.

5.2 Method 2: Upscaling the Image Using an Upscale Model

The Second method focuses on upscaling the image itself using an upscale model. Follow these steps:

1. Drag out the image and search for the "Image Upscale Model" function.
2. Install the desired upscale model, such as the "4X-Ultra Sharp" model.
3. Connect the image to the upscale model and specify the desired upscale factor using the "Image Scale By" function.
4. Preview the upscaled image and adjust the denoise value to refine the output.
5. Connect the upscaled image to a K-Sampler for noise removal and additional image enhancement.

Remember to experiment with different denoise values to find the optimal balance between image fidelity and denoising.

5.3 Method 3: Upscaling Using the Custom Node

The third and final method involves upscaling the image using the Custom Node feature in ComfyUI. Follow these steps:

1. Install the "Ultimate SD Upscale" custom node from the Manager.
2. Restart ComfyUI to ensure the installation is complete.
3. Connect the necessary inputs, including the upscale model, positive and negative prompts, and the image you want to upscale.
4. Configure the upscale factor, seed, and other settings in the Ultimate SD Upscale node.
5. Queue the prompt and generate the upscaled image.
6. Adjust the denoise value to control the level of noise removal and quality preservation.

Please note that the Ultimate SD Upscale method provides more control and allows for maintaining the original image's characteristics during the upscaling process.

6. Conclusion

In this tutorial, we explored the various methods of upscaling images using ComfyUI. By downloading the AI Angel Mix checkpoint and testing it with ComfyUI, we were able to generate high-quality images. We then delved into three different methods to upscale the images, each with its own advantages and considerations. Whether upscaling the latent directly, using an upscale model, or leveraging the custom node, ComfyUI provides powerful tools for enhancing image resolution and quality. Experiment with these methods and settings to achieve the desired results in your image upscaling projects.

Resources:

• CivitAI
• ComfyUI
• Photopea