SPARK.Chroma is a fine-tuned model designed for generating realistic images. Based on the Chroma1-HD model with 8.9B parameters and Apache 2.0 license.
Warning: This model is a preview release and does not yet reflect the full vision — outputs may lack realism and fine detail, and in some cases it may be inferior to Chroma1‑HD. Future releases will use different fine‑tune settings to improve quality.
How to Use
For ComfyUI:
Place the ae.safetensors in the following path: ComfyUI_windows_portable\ComfyUI\models\vae
Place t5xxl_fp16.safetensors in the following path: ComfyUI_windows_portable\ComfyUI\models\clip
Place the SPARK.Chroma_preview.safetensors in the following path: ComfyUI_windows_portable\ComfyUI\models\unet or ComfyUI_windows_portable\ComfyUI\models\diffusion_models
Load the BasicWorkflow.json into ComfyUI and run
Optimal Generation Settings
Sampling Method and Schedule Type: dpmpp_2m simple
Sampling Steps: 40
CFG Scale: 3.5-4.0
Negative Prompt: low quality, ugly, unfinished, out of focus, deformed, disfigure, blurry, smudged, restricted palette, flat colors, noisy, artifacts, fake, generated
Limitations
This version of the model does not have a variety of styles and is intended for realism.
There may be issues with anatomy and text.