🐼Midjourney 教程 Mid journey imagine指令详解 知识点:Midjourney prompt结构、AR指令 AI作画教学第3集(上)

2 Mar 202306:03

TLDRIn this third installment of the Midjourney tutorial series, the video delves into the structure of prompts and their essential role in guiding the AI art tool to create desired images. It explains the three main components of a prompt: reference images, description, and parameters, with a focus on the importance of the description. The tutorial demonstrates how to use the AR parameter to control aspect ratio and shows the difference between using and not using it. It also suggests modifying the description to shift the art style from realistic to cartoonish, showcasing the flexibility and customization possible with Midjourney.


  • 📝 Introduction to Midjourney: The video continues a series of tutorials about Midjourney, an AI drawing tool, after covering registration and a basic drawing in previous episodes.
  • 🎨 Understanding Prompts: The structure of a prompt in Midjourney is explained, consisting of three parts: a reference image link (optional), a description of the desired image, and parameters for image generation (also optional).
  • 🔗 Optional Image Link: Users can provide a .png or .jpg image link as a reference for the AI to draw from, but this is not mandatory.
  • 🖌️ Central Description: The most important part of the prompt is the description, which tells Midjourney what the desired image should look like.
  • 🛠️ Parameters for Customization: Parameters can be used to set specific generation settings, such as aspect ratio and the engine used for creating the image. If not specified, Midjourney uses default values.
  • 📐 Aspect Ratio Control: The aspect ratio of the generated image can be controlled using the 'ar' parameter followed by a ratio, e.g., 'ar 16:9'.
  • 🤖 Default Aspect Ratio: If no aspect ratio is specified, Midjourney defaults to a 1:1 square aspect ratio.
  • 🎭 Adjusting Style: To generate images in a different style, such as cartoonish, the description can be modified to include keywords like 'cartoon'.
  • 💻 Midjourney's Limitations: The AI might slightly adjust the specified aspect ratio during the generation process, and the final output may not exactly match the input ratio.
  • 🌐 Community Interaction: The video script mentions the Midjourney community and the creator's interaction with it, highlighting a social aspect of using the tool.

Q & A

  • What is the main topic of this video tutorial?

    -The main topic of this video tutorial is an introduction to commonly used commands in Midjourney, an AI drawing tool, to help viewers have a deeper understanding of the platform.

  • What was covered in the first video of the Midjourney tutorial series?

    -The first video of the Midjourney tutorial series covered the registration process for Midjourney.

  • What did the second video in the series focus on?

    -The second video focused on using Midjourney to draw a dog.

  • What are the three main components of a prompt in Midjourney?

    -The three main components of a prompt in Midjourney are the image link (green), the description of the image (purple), and the parameters (orange).

  • Is the image link in a prompt mandatory?

    -No, the image link in a prompt is not mandatory. It serves as a reference for the AI when drawing.

  • What is the purpose of the description part of a prompt?

    -The description part of a prompt is crucial as it tells Midjourney what kind of image is needed, guiding the AI to generate the desired output.

  • What can the parameters section of a prompt be used for?

    -The parameters section can be used to set the final generation parameters of the image, such as aspect ratio and the engine used to generate the image.

  • How can you set the aspect ratio of an image in Midjourney?

    -You can set the aspect ratio of an image in Midjourney by using the '--ar' parameter followed by the desired aspect ratio, for example, '--ar 16:9'.

  • What happened when the tutorial creator tried to generate an image without using the '--ar' parameter?

    -When the tutorial creator tried to generate an image without using the '--ar' parameter, Midjourney defaulted to creating a square (1:1) aspect ratio image.

  • How did the creator suggest changing the style of the generated image?

    -The creator suggested changing the description by adding the keyword 'cartoon' to generate an image with a more cartoonish style.

  • What was the issue encountered by the tutorial creator during the recording?

    -The tutorial creator encountered a technical issue with Midjourney crashing twice during the recording, which affected their ability to continue the tutorial smoothly.

  • How did the tutorial creator conclude the video?

    -The tutorial creator concluded the video by mentioning that they would continue the topic in the next video, as they had to stop recording due to the technical issues with Midjourney.



🎨 Introduction to Midjourney Tutorial and Prompt Structure

This paragraph introduces the viewer to the third video in a Midjourney tutorial series. The host recaps the previous videos, where they discussed registration in the first and created a dog illustration in the second. The focus of this video is to delve into the commonly used commands of Midjourney, an AI drawing tool, to enhance the user's understanding. The host explains the structure of the 'prompt' in Midjourney, which consists of three parts: a reference image (optional), a description of the desired image, and parameters for image generation. The video demonstrates how to use these components to generate an image of a panda playing guitar with a 16:9 aspect ratio, and how to adjust the aspect ratio using the AR parameter. The host also mentions the default settings Midjourney uses if no parameters are provided.


🖌️ Modifying Prompts for Different Art Styles

In this paragraph, the host discusses how to modify the 'prompt' to generate images with different styles, such as changing from a realistic to a cartoon style. The host suggests two solutions: altering the description by adding the keyword 'cartoon' to the prompt, and then demonstrates this by creating an image of a cartoon panda playing guitar with a 16:9 aspect ratio. However, the video ends abruptly with a technical issue, and the host humorously references the Midjourney community's reaction to similar issues, promising to continue the tutorial in the next video.




Midjourney is an artificial intelligence-based drawing tool that users can utilize to generate images based on textual descriptions. In the video, the tool is central to the tutorial, which aims to teach viewers how to use Midjourney effectively to create artwork.


A prompt in the context of Midjourney is a textual description that users input to guide the AI in generating a specific image. It is a crucial component of the tool as it allows users to communicate what they want the final image to look like.


In Midjourney, 'imagine' is a command that initiates the AI's image generation process based on the prompt provided by the user. It is the action that triggers the creation of the artwork as per the user's instructions.

💡Reference Image

A reference image is an optional element of the prompt that users can include to provide the AI with a visual example to guide the generation of the artwork. It serves as a reference for style or content that the user wants in the final image.


The description is a mandatory part of the prompt where users provide a textual depiction of the desired image. It is the primary means by which users communicate their artistic vision to Midjourney.


Parameters are optional settings within the prompt that allow users to customize the technical aspects of the image generation, such as aspect ratio and the rendering engine used by Midjourney.

💡Aspect Ratio (AR)

The aspect ratio is the proportional relationship between the width and the height of an image. In Midjourney, users can specify an aspect ratio to control the shape of the generated image, which can affect its appearance on different devices or in various contexts.

💡Default Values

Default values in Midjourney refer to the preset settings that the AI uses when no specific parameters are provided by the user. These values ensure that the AI can still generate an image even if the user does not customize the parameters.

💡Cartoon Style

Cartoon style refers to a visual aesthetic that is characteristic of animated or comic book art, often featuring exaggerated features and simplified forms. In the context of Midjourney, users can modify their prompts to include descriptors that guide the AI towards generating images in a cartoon style.


The community in the context of Midjourney refers to the group of users who engage with the AI tool, share their experiences, and discuss its features and outcomes. It is a space for users to interact and learn from one another.

💡Image Generation

Image generation is the process by which Midjourney AI takes the input from the prompt and creates a visual representation based on that input. It involves interpreting the textual description and parameters to produce a corresponding image.


Introduction to Midjourney tutorial series and recap of previous videos.

Explanation of Midjourney's registration process from the first video.

Demonstration of using Midjourney to draw a dog in the second video.

Overview of commonly used Midjourney commands for a deeper understanding.

Detailed explanation of the structure of prompts in Midjourney.

Description of the three components of a prompt: image link, description, and parameters.

Optional nature of the image link component in the prompt.

Importance of the description component in generating images.

Parameters component for setting image generation details like aspect ratio and engine.

Default values used by Midjourney if parameters are not specified.

Example of generating an image of a panda playing guitar with a 16:9 aspect ratio.

Use of the AR parameter to control the aspect ratio of generated images.

Demonstration of the difference between images generated with and without the AR parameter.

Observation that Midjourney defaults to a realistic style for generated images.

Suggestion to modify the description for generating cartoon-style images.

Technical issue encountered during the demonstration with Midjourney's service.

Community interaction and humor despite the technical issue.

Conclusion and anticipation for the next part of the tutorial series.