OpenMOSS-Team/MOSS-Image-Base
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- License
- apache-2.0
- Size
- 25 GB
- Revision
- main
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User guide · 中文用户指南 · ComfyUI
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MOSS-Image-Base is the base text-to-image model in the MOSS-Image family from OpenMOSS. It supports natural-language prompts, tag sequences, and JSON layouts for controlling text placement and object arrangement.
Base vs. SFT
In this example, SFT produces clearer text grouping and a more organized whiteboard layout.
Quick start
Use Python 3.10 or later and an NVIDIA GPU with CUDA support. Install a PyTorch 2.9 or later build compatible with your CUDA environment, then install:
The model and custom pipeline code are downloaded and cached automatically. You
can also pass a complete local model directory to from_pretrained.
The transformer and text encoder use bfloat16; the VAE and initial noise use
float32. The bundled VAE uses the FLUX.2 small decoder.
For the Gradio interface, CPU offload, and compilation options, follow the project quick start. For ComfyUI, search for MOSS-Image in ComfyUI Manager to install the native plugin. Integration into the official ComfyUI repository is in progress. See the installation and usage guide and example workflow.
Sampling settings
The default guidance uses two transformer forwards per step. Pass
uncond_skip_layers=[] to disable negative-branch skipping, or set
negative_prompt to provide a negative prompt. Python API image dimensions must
be positive multiples of 16.
See the user guide for resolution, sampling, prompt, and LoRA training recommendations.
Prompt enhancer skill
The MOSS-Image Prompt Enhancer turns image ideas into detailed captions or spatial Layout prompts. It is designed for GPT-6-family agents with local file and Python tools. The bundled script converts pixel-coordinate drafts into compact JSON with integer centered coordinates; it does not call an image-generation service.
Install the skill folder in your agent's skills
directory, then invoke $moss-image-prompt-enhancer with your image idea, desired
caption or Layout output, and any canvas dimensions. Paste the compiled result
into MOSS-Image's positive prompt; for Layout, use the same generation dimensions.
Layout-to-image generation
Pass a JSON layout as the prompt to describe the scene, rendered text, objects,
and their positions. Layouts use summary.caption and items, with
bbox_format: "yxyx" and bbox_coord_space: "abs_centralized".
With the Python API, serialize the layout using
json.dumps(layout, ensure_ascii=False) and pass it to pipe. In Gradio, paste
the JSON into the Prompt field and set the matching image dimensions.
See the layout format and example.
Layouts can also support controlled editing and user-friendly layout tools. Edit text, element descriptions, and bounding boxes to adjust image content and composition in a structured way.
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Showcase
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Citation
License and acknowledgements
The model weights and bundled inference code are released under the Apache License, Version 2.0 [blocked].
We thank the Diffusers, Qwen, and FLUX teams.