【4K、8K、16K拡大】Stable Diffusionのアップスケーラーをマスターする!

1 Dec 202319:53

TLDRThe video script discusses the challenges and techniques of upscaling images using AI, particularly focusing on the process of creating 4K, 8K, and even 16K images. It explores the use of various AI upscaling models and tools, such as Extra High Res, Style, Ultimate SD Scale, and Tile Diffusion, to enhance image quality without losing detail. The script also touches on the importance of setting up the right parameters and the use of control tiles to maintain the original shape of the image when scaling. The video aims to guide viewers through the intricacies of AI image upscaling, offering insights into the different methods available and their respective outcomes in terms of quality and processing time.


  • 🖼️ The process of creating 4K images with AI can be surprisingly challenging and time-consuming due to the generation time and memory constraints.
  • 🧠 Understanding the basics of upscaling, such as the difference between 4x, 8x, and 16x scaling, is crucial for mastering the technique.
  • 🌐 The script mentions the use of Stable Diffusion and its various versions, emphasizing the importance of using the latest version for better results.
  • 🔍 The importance of filling in the gaps created by upscaling is highlighted, as it prevents the AI from simply enlarging the original image without adding new information.
  • 🎨 The role of AI upscalers is to intelligently fill in these gaps with new pixels that match the style and content of the original image.
  • 🖌️ The script discusses the use of different models for upscaling, such as Realistic, esrG4xPlus, and the selection process based on the desired outcome.
  • 📸 The process of starting with a smaller image size (e.g., 768x432) and then scaling up to larger sizes (e.g., 4K) is outlined.
  • 🛠️ The script provides practical advice on setting up the UI for upscaling, including adjusting file size limits and other settings to prevent overloading the system.
  • 🔧 The use of multiple upscaling methods, such as Extra, Ultimate SD Scale, and Tiled Diffusion, is discussed, each with its own strengths and weaknesses.
  • ⏱️ The trade-offs between image quality, generation time, and the amount of computation used are considered when choosing an upscaling method.
  • 🚀 The script concludes with an encouragement to experiment with different upscaling techniques to find the best fit for the project at hand.

Q & A

  • What is the main challenge discussed in the script related to AI and image upscaling?

    -The main challenge discussed is the time-consuming process and memory issues when upscaling images using AI, particularly when dealing with high magnification factors like 8x or 16x.

  • What does the script suggest about the role of AI in upscaling images?

    -The script suggests that AI plays a crucial role in upscaling images by filling in the gaps and creating new information that wasn't present in the original image, leading to enhanced quality and resolution.

  • What are the different upscaling methods mentioned in the script?

    -The script mentions several upscaling methods, including Extra High Resolution, Ultimate SD Scale, and Tile-based Diffusion, each with its own set of parameters and models for different scaling needs.

  • How does the script address the issue of image quality when upscaling?

    -The script addresses image quality by recommending the use of specific AI upscaling models and functions, such as High Resolution, Extra High Resolution, and Realistic DSR G4x Plus, to ensure the best possible output.

  • What is the significance of the 'After Retoucher' function in the script?

    -The 'After Retoucher' function is significant as it allows for further refinement of the upscaled image, particularly the face, to achieve a cleaner and more detailed result.

  • What does the script imply about the importance of understanding AI upscaling models and functions?

    -The script implies that having a good understanding of AI upscaling models and functions is crucial for achieving the desired results, as it allows artists to select the most appropriate tools and settings for their specific needs.

  • What is the role of 'Tile-based Diffusion' in the upscaling process described in the script?

    -Tile-based Diffusion is used to further refine the upscaled image, particularly for maintaining the shape and structure of the image when dealing with larger magnification factors, thus enhancing the overall quality.

  • How does the script suggest one should approach upscaling images using AI?

    -The script suggests a step-by-step approach, starting with creating the original image at a manageable size, then progressively upscaling using different AI functions and models, while carefully adjusting parameters to maintain quality.

  • What is the significance of the 'Control Net' in the context of Tile-based Diffusion?

    -The 'Control Net' in Tile-based Diffusion is significant as it helps to maintain the overall structure and form of the image during the upscaling process, preventing distortion and ensuring a more coherent final result.

  • What does the script recommend regarding the use of different upscaling models for different needs?

    -The script recommends using different upscaling models depending on the specific needs of the project, such as Extra for quick results, Realistic DSR G4x Plus for high-quality enlargements, and Tile-based Diffusion for maintaining image structure at larger magnifications.

  • How does the script address the issue of driver support for AI upscaling tools?

    -The script mentions that driver support is essential for the efficient use of AI upscaling tools, and it suggests that users should ensure their systems are up-to-date with the latest drivers for optimal performance.



🎨 AI in Image Upscaling Challenges and Solutions

This paragraph discusses the challenges of creating high-quality upscaled images using AI, particularly the time-consuming process and memory issues. It introduces the Darte sisters who tackle these problems, mastering the art of upscaling images by multiples, such as 8x and 16x, and the considerations when upscaling beyond the original image's details. The paragraph also touches on the technical aspects of upscaling, like the importance of filling in the gaps created by enlarging pixels and the role of AI in creating new details where none existed before.


🖼️ Exploring Different Upscaling Techniques and Settings

The paragraph delves into the specifics of four different upscaling models: Real-ESR, G4xPlus, and their application in 4K image resolution enhancement. It discusses the practicality of starting with a smaller canvas size for AI to easily write on and the process of iteratively upscaling the image. The importance of careful execution at each upscaling step is emphasized, as it significantly affects the final image quality. The paragraph also mentions the use of various functions like Image to Image, Extra High Resock Style, and Diffusion Ultimate SD Scale, and the need for stable software versions for optimal performance.


🚀 Accelerating the Upscaling Process with AI

This section focuses on the practical application of AI in image upscaling, detailing the steps and settings involved in using Stable Diffusion's UI for upscaling images. It covers the installation of necessary extensions like Tile Diffusion for further enhancement. The paragraph explains the process of setting up parameters for different upscaling functions, such as Extra, Ultimate SD Scale, and Tile Diffusion, and the importance of understanding which function is best suited for the task at hand. It also touches on the use of control net tiles to maintain the shape of the image when resizing.


🌐 Comparing Upscaling Methods and Their Outcomes

The final paragraph compares the three upscaling methods discussed earlier: Extra, Ultimate SD Scale, and Tile Diffusion, based on image quality, generation time, and VRAM usage. It provides insights into when to use each method depending on the desired balance between these factors. The paragraph also explores the possibility of upscaling to 16K resolution, acknowledging that while it's technically possible, it may not have practical applications for most users. It concludes with a brief mention of other available upscaling models and encourages viewers to explore them further.



💡AI Upscaler

An AI Upscaler is a technology that uses artificial intelligence to increase the resolution of images or videos. In the context of the video, it is used to upscale 4K images to even higher resolutions, such as 8K or 16K, by intelligently filling in the details that would otherwise be lost during the enlargement process. The script mentions the use of AI to upscale images as a way to maintain or enhance image quality while increasing the canvas size.

💡Memory Issues

Memory issues refer to problems that arise when a computer or software does not have enough RAM to handle the tasks it is performing. In the video script, the creator discusses the challenges of AI upscaling, including the memory consumption that can lead to performance slowdowns or crashes. This is particularly relevant when dealing with high-resolution images or complex AI models.

💡Dar Twin Sisters

The Dar Twin Sisters seem to be a reference to a specific AI model or technology used for upscaling images. The script suggests that they play a role in resolving the challenges associated with the upscaling process, possibly by optimizing memory usage or improving the quality of the upscaled images.

💡Image Quality

Image quality refers to the clarity, sharpness, and overall visual fidelity of an image. In the context of the video, it is crucial because the goal of upscaling is to increase the resolution without losing or degrading the original image's quality. The script discusses various AI upscaling techniques and their impact on maintaining or improving image quality.

💡Stable Diffusion

Stable Diffusion is a type of AI model used for generating images from textual descriptions or upscaling existing images. In the video, it is mentioned as a tool that can be utilized to upscale images, suggesting that it has features or settings that can be adjusted to achieve the desired results.

💡Upscaling Models

Upscaling models refer to the specific algorithms or neural networks used by AI upscalers to increase the resolution of images. The script mentions several models, such as 'Real ESR G4xPlus', which are designed to handle different aspects of the upscaling process, ensuring that the final image retains the quality and details of the original.

💡Control Net Tiles

Control Net Tiles are a feature within some AI upscaling models that help maintain the structure and details of an image when it is scaled up. They act as a guide for the AI to fill in the new pixels in a way that is consistent with the original image's content, thus preserving the image's integrity.

💡Image to Image

Image to Image is a functionality within AI upscaling tools that allows users to input an image and directly process it to achieve a specific output, such as increasing the resolution. This feature streamlines the upscaling process by eliminating the need for intermediate steps or separate inputs.

💡Text to Image

Text to Image is a feature in AI tools that generates an image based on a textual description provided by the user. This is often used to create visual content from written prompts and can be a starting point for upscaling, where an initial image is generated from text and then enlarged using AI upscaling techniques.

💡After Retiler

After Retiler is a term used in the context of AI image processing to describe a feature or step that refines the image after an initial upscaling or retiling process. It aims to enhance the quality of the upscaled image by adding details and improving the overall appearance.

💡Tile Diffusion

Tile Diffusion is a method used in AI upscaling that involves breaking down an image into smaller parts or 'tiles' and processing each tile individually. This can help maintain the quality of complex images and ensure that details are preserved across the entire upscaled image.


AI can create 4K images, which is surprisingly difficult and time-consuming due to the generation time and memory constraints.

The Darutowa sisters solve the problem of memory shortage during the upscaling process.

Mastering super enlargement is achieved through practice and understanding the process.

The importance of considering the gaps in the upscaled image and filling them with new information.

The process of upscaling involves not just enlarging but also adding details that were not in the original image.

The discussion on the practical use of 16K upscaling and its potential applications.

The comparison between different upscaling methods and their impact on image quality and processing time.

The use of Stable Diffusion and its versions for upscaling images.

The significance of choosing the right upscaling model, such as RealESRG4xPlus, for creating high-quality images.

The step-by-step guide on how to upscale images using AI, starting from a small 768x432 image.

The explanation of the different upscaling functions and models available in AI upscalrs.

The practical application of Text-to-Image and High-Resolution Fix for initial image creation.

The importance of Stable Diffusion's version for efficient upscaling and the comparison between old and new versions.

The process of setting up the UI for upscaling, including file size limit and noise options.

The use of Extra, Ultimate SD Scale, and Tiled Diffusion for different upscaling needs.

The detailed guide on using Image-to-Image for upscaling and the role of control net tiles.

The exploration of different AI upscaling models and their potential use cases.

The final result of upscaling a 4K image to 16K and the discussion on the practicality of such high resolutions.