SG161222/SPARK.Chroma_preview

SPARK.Chroma — Model for Realistic Image Generation

Overview

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.

SPARK.Chroma_preview

START DATE: October 14, 2025

LAST UPDATE: October 30, 2025

DATASET SIZE: 2400 Images

EQUIPMENT: 1 x RTX 4090 (24GB)

TRAINING TIME: ~ 116h 40m

You can support me directly on my Boosty

---

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.