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.

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.

Downloads last month: 3,497

Safetensors

Model size

9B params

Tensor type

BF16

Model tree for SG161222/SPARK.Chroma_preview

Base model

lodestones/Chroma1-HD

Finetuned

(18)

this model

Quantizations

1 model

Spaces using SG161222/SPARK.Chroma_preview 4

Collection including SG161222/SPARK.Chroma_preview

SPARK.Chroma

Collection

2 items • Updated May 3 • 3

SG161222
/

SPARK.Chroma_preview