【Stable Diffusion】老照片修复+图片高清化+一键抠图超详细讲解

17 Jun 202315:09

TLDRIn this informative tutorial, the AI assistant, known as the AI Prince, shares valuable insights on enhancing the clarity of images using the Stable Diffusion (SD) platform. The video covers various methods for image upscaling, with a focus on the 'extras high-definition' feature and the 'Stable SR' script. The assistant guides viewers through the process of selecting the right model, such as the highly recommended '4xUltrasharp' for general images and 'anime 6B' for anime. The tutorial also delves into the installation and use of the 'remove background' plugin for advanced image editing. By the end, viewers are equipped with the knowledge to transform模糊 images into high-definition masterpieces.


  • 🖼️ To enhance image clarity in SD (Stable Diffusion), use the 'extras high-definition' feature or 'stable SR script'.
  • 🔍 The 'extras high-definition' allows for both single image and batch processing of images, with options to specify resolution and scaling.
  • 📈 The 'scaling ratio' adjusts the output image size, such as doubling the pixels from 512x512 to 1024x1024.
  • 🖼️ '指定分辨率缩放' (Specify Resolution Scaling) is used to maintain the aspect ratio of the original image during scaling.
  • 🔄 'Upscaler' models are used for image enlargement; '4xUltrasharp' is recommended for general use due to its speed and detail preservation.
  • 🎨 For anime images, use the 'anime 6B' upscaler for the best results.
  • 👤 'GFPGAN' and 'Codeformer' are specialized for facial detail enhancement, with GFPGAN being preferred for its accuracy.
  • 🌟 'remove background' (REMBG) is a powerful feature for extracting the subject from an image, with various models catering to different use cases.
  • 💻 Installation issues with REMBG can be resolved by navigating to the specific webui folder and running a command in the terminal.
  • 🔧 Experimentation with 'Erode size', 'foreground threshold', and 'background threshold' can lead to optimal settings for background removal.
  • 📝 'Image information' can be used to retain details like keywords and parameters used in image generation for future reference.
  • 🚀 The tutorial aims to help users master AI image enhancement techniques using Stable Diffusion.

Q & A

  • What is the main issue addressed in the script?

    -The main issue addressed in the script is how to enhance the clarity and resolution of images generated through Stable Diffusion when they are initially blurry or unclear.

  • What are the two primary methods introduced for image enhancement?

    -The two primary methods introduced for image enhancement are 'Extras High Definition' and 'Stable SR script'.

  • How does the 'Extras High Definition' feature work?

    -The 'Extras High Definition' feature works by allowing users to select either single image processing or batch processing for multiple images. Users can adjust the scaling ratio to increase the pixel size of the output image and choose to crop the image if the aspect ratio is not maintained.

  • What is the purpose of the '4xUltrasharp' model?

    -The '4xUltrasharp' model is a universal upscaling algorithm designed to enhance the quality of images by making them sharper and more detailed without over-smoothing or losing important details.

  • How does the 'Upscaler' feature differ from 'Extras High Definition'?

    -The 'Upscaler' feature allows users to choose different upscaling algorithms or models, such as 'Lanczos', 'Nearest', '4xUltrasharp', and 'anime 6B', each designed for specific types of images like photographs or anime, providing more control over the final output quality.

  • What are the two models recommended for facial detail enhancement?

    -The two models recommended for facial detail enhancement are 'GFPGAN' and 'Codeformer', with GFPGAN being preferred for its ability to retain more original facial details.

  • How can the 'Remove Background' feature be installed?

    -The 'Remove Background' feature, also known as 'stable diffusion webui rembg', can be installed by copying the installation link from the video description, pasting it into the web browser, and following the installation prompts.

  • What is the recommended workflow for using the 'Remove Background' feature?

    -The recommended workflow for using the 'Remove Background' feature involves selecting the 'u2net' model for general use, adjusting the 'Erode size' for edge softness, and using 'foreground threshold' and 'background threshold' to refine the extraction.

  • What is the significance of the 'Image Information' feature?

    -The 'Image Information' feature is significant as it captures and displays all the parameters and keywords used in the image generation process, which can be helpful for understanding the context and settings of the created images.

  • What is the solution to the 'runtime error' when using the 'Remove Background' plugin?

    -The solution to the 'runtime error' when using the 'Remove Background' plugin is to navigate to the webui folder, input the specific command into the terminal, and restart the YBI after the installation is complete.

  • What type of images is the 'anime 6B' upscaler algorithm best suited for?

    -The 'anime 6B' upscaler algorithm is best suited for enhancing anime images, as it is specifically designed to maintain the quality and details of anime art style.



🖼️ Enhancing Image Clarity with Stable Diffusion Techniques

This paragraph introduces viewers to methods for improving the clarity of images using Stable Diffusion (SD). The AI assistant explains various techniques to upscale and enhance images, including dealing with blurry or old photos. It highlights two standout methods: 'extras high-definition' and 'stable SR script'. The 'extras high-definition' method is described as simple yet effective, with options for single image or batch processing. The paragraph also delves into the specifics of scaling images, the importance of aspect ratio, and the use of the '4xUltrasharp' model for superior results in image upscaling.


🎨 Comparing Upscaling Models for Optimal Results

The second paragraph focuses on comparing different upscaling models within the Stable Diffusion web interface. It discusses the effectiveness of '4xUltrasharp' and 'anime 6B' for enhancing real and anime images, respectively. The assistant provides insights on when to use Lanczos and Nearest algorithms, especially in conjunction with Upscaler 2 for balancing noise reduction. The paragraph also touches on the use of ESRGAN and BSRGAN models, emphasizing the importance of choosing the right model for the desired outcome. Additionally, it introduces the concept of面部修复 (facial repair) using GFPGAN and Codeformer models, highlighting their distinct approaches to facial detail enhancement.


🌟 Advanced Techniques for Background Removal and Image Segmentation

This paragraph delves into advanced techniques for background removal and image segmentation using the Stable Diffusion web interface. The assistant introduces the 'remove background' feature and its various algorithms, such as u2net and u2net_human_seg, which are effective for general and human segmentation tasks. It also discusses the lightweight version of u2net and the specialized isnet anime for anime images. The paragraph provides a practical example of using u2net for background removal and offers tips on adjusting the 'Alpha Matting' settings to refine the抠图 (image segmentation) results. The assistant shares a personal preset for achieving optimal background removal without black edges and emphasizes the importance of post-processing for perfect results.


📸 Utilizing Image Information for Enhanced AIGC Artwork

The final paragraph emphasizes the utility of 'Image Information' in retaining details about the creation process of AIGC (Artificial Intelligence Generated Content) artwork. It explains how this feature can store important parameters and keywords used in image generation, such as sampling steps, CFG scale, and seeds. The assistant encourages viewers to follow for more tutorials on AIGC and Stable Diffusion, promising to share more knowledge on these topics. The paragraph concludes with a call to action for viewers to like, subscribe, and comment with their appreciation for the tutorial on transforming blurry images into high-definition works of art.



💡SD (Stable Diffusion)

Stable Diffusion, often abbreviated as SD, is an AI model used for generating high-quality images from textual descriptions. In the context of the video, it is the primary tool discussed for enhancing image clarity and resolution. The video outlines various methods and settings within SD to achieve super clear images and restore old, blurry photos.

💡High Definition (HD)

High Definition refers to a category of video and image resolution standards that offer a higher pixel density than standard-definition images. In the video, the term is used to describe the process of increasing the clarity and resolution of images, making them appear sharper and more detailed.


An Upscaler is a tool or algorithm used to increase the size of an image or video without losing quality. In the context of the video, the AI assistant introduces different upscaling models within the Stable Diffusion platform, which can be used to enhance the resolution of images, particularly highlighting the '4xUltrasharp' model for its effectiveness.

💡Model Algorithm

A model algorithm refers to the underlying computational formulas and processes used by AI models to perform specific tasks, such as image upscaling or enhancement. In the video, the AI assistant discusses the importance of choosing the right model algorithm for achieving high-definition results within the Stable Diffusion platform.

💡Batch Processing

Batch processing is a method of handling multiple tasks or jobs as a group, often used to automate repetitive tasks for efficiency. In the video, batch processing is referenced as a feature within Stable Diffusion that allows users to process multiple images at once, rather than individually.


Resolution refers to the number of pixels in an image, which determines its size and detail. Higher resolutions mean more pixels and thus more detail. The video discusses the importance of resolution in achieving high-definition images and provides guidance on how to adjust resolution settings in Stable Diffusion.


Cropping in image editing refers to the process of removing parts of an image to improve its composition or focus. In the context of the video, cropping is mentioned as a necessary step when the aspect ratio of the upscaled image does not match the original, to avoid stretching and maintain the image's integrity.


GFPGAN is a type of AI model specifically designed for face restoration and enhancement. It is capable of improving the clarity and detail of facial features in images. In the video, GFPGAN is highlighted as a tool for facial detail enhancement during the image upscaling process.


Codeformer is an AI model used for facial reconstruction, which can alter facial features to some extent. It is used in the context of the video to modify and enhance the facial details in images, but it is noted that it may change the original facial characteristics, which could be undesirable for some applications.

💡Remove Background

Remove Background is a feature that allows for the automatic extraction of the main subject from an image, removing the background elements. In the video, this feature is discussed as part of the Stable Diffusion web interface, with the 'stable diffusion webui rembg' plugin being a specific tool mentioned for this purpose.

💡Alpha Matting

Alpha Matting is a technique used in image editing to refine the edges of a selection or a mask, creating a smoother transition between the subject and the background. In the video, it is used to adjust the抠图 (clipping path) edges for a more natural and seamless look.


The AI assistant introduces methods to enhance the clarity of images generated by Stable Diffusion, addressing common issues with image sharpness.

The tutorial focuses on leveraging the 'extras high-definition' feature and 'stable SR script' for image enlargement and clarity improvement.

Batch processing of images is highlighted as a time-saving method for processing multiple images at once.

The importance of selecting the correct scaling ratio to maintain image proportions is emphasized.

The '4xUltrasharp' model is recommended as a versatile and effective upscaling algorithm for various images.

The 'anime 6B' upscaler is specifically recommended for enhancing the quality of anime images.

The 'Upscaler 2' is explained as a tool for balancing the effects of other algorithms, particularly when over-smoothing occurs.

The 'GFPGAN' model is introduced for its ability to specifically enhance facial details in images.

The 'Codeformer' model is described as altering facial features, which can be used for rebuilding facial details.

The 'remove background' feature is discussed as a powerful tool for extracting the subject from the background of an image.

The 'u2net' model is recommended for general use cases in image segmentation.

The 'u2net_human_seg' model is specialized for human segmentation, useful for tasks like model dressing.

The 'isnet anime' model is suggested for anime image segmentation, offering precise extraction of anime characters.

A detailed preset for the 'u2net' model is shared, including optimal values for 'Erode size', 'foreground threshold', and 'background threshold'.

The tutorial addresses a common issue with the 'remove background' plugin and provides a solution for resolving runtime errors.

The 'image information' feature is introduced as a way to retain details about the generation process of images.

The AI assistant encourages viewers to follow for more tutorials on AIGC painting and Stable Diffusion.