Strength

Also known as: strength, denoise

Strength determines how much an input image is transformed during generation. At 0, the original image is untouched. At 1.0, the model generates an entirely new image, ignoring the original. This parameter is key for image-to-image workflows.

What It Does

When you provide a reference image alongside a prompt (image-to-image generation), the model partially noises the input image, then denoises it according to the text prompt. The strength parameter controls how much noise is added. A low strength preserves most of the original composition, colors, and structure, making only subtle adjustments. A high strength gives the model more creative freedom, potentially departing significantly from the source image.

This is critical for workflows like style transfer, inpainting, and iterative refinement.

Value Ranges

Low (0.1–0.3)

Subtle adjustments. Original composition and colors are largely preserved. Good for minor touch-ups or gentle style changes.

Mid (0.4–0.6)

Noticeable transformation while maintaining the overall structure. Ideal for style transfers or moderate creative adjustments.

High (0.7–1.0)

Heavy transformation. The model may discard most of the input image's structure. Useful when you want a fresh take inspired loosely by the original.

Visual Comparison

Image pending

strength = 0.2

Image pending

strength = 0.5

Image pending

strength = 0.9

Tips

Start at 0.5 for image-to-image and adjust up or down based on results.
For inpainting, lower strength preserves surrounding areas better.
If results look muddy or half-baked, you likely need a higher strength.
Combining low strength with more inference steps can help preserve detail while still following the prompt.