What is JoyCaption?

JoyCaption is a VLM (Visual Language Model) for generating captions from images.

It can generate high-accuracy captions for a wide range of genres such as real photos, anime, and digital art. Above all, since it handles NSFW images without censoring, it is popular as a "caption-specific model" even now that higher-performance general-purpose MLLMs have appeared.

Because it is based on LLaVA-based multimodal models, it cannot be said to be lightweight compared to taggers, but it has the ease of being easy to incorporate into a local image generation pipeline as a ComfyUI node.

Custom Node

JoyCaption Node

Generates a caption from the input image.

joycaption.json

  • prompt_style

    • Descriptive
      • Writes as formal and long prose.
      • Useful when you want to keep the content of the image in detail, but tends to be redundant to use as a prompt as is.
    • Straightforward
      • Writes in a concise and objective style.
      • A style that is easy to divert as is for prompts and captions for LoRA.
    • Stable Diffusion Prompt
      • Writes in a prompt format for Stable Diffusion.
    • Danbooru tag list
      • Lists tags in Danbooru tag format (e.g., 1girl, blue_hair).

  • caption_length

    • Specifies the volume of the caption to output (short/long).

  • Extra Options

    • Sets additional instructions to guide caption generation.
    • For example, you can specify a policy such as "write in detail / do not touch much" about camera angle, image quality/resolution, NSFW elements, etc.