SD Prompt syntax

Adjusting Prompt Weight with Syntax

Note: This syntax applies specifically to Stable Diffusion (SD) and SDXL. Other AI models may use different weighting formats.

1. Increasing Weight: ()

Use parentheses to emphasize a tag, making it more prominent in the generated image.

• Nesting Syntax: Nesting parentheses increases weight exponentially.

  • (keyword) = $1.1$

  • ((keyword)) = $1.1 \times 1.1 = \mathbf{1.21}$

  • (((keyword))) = $1.1 \times 1.1 \times 1.1 = \mathbf{1.33}$

• Explicit Weight Syntax: You can also define exact numerical values directly, such as (keyword:1.1) or (keyword:1.25).

2. Decreasing Weight: []

Use brackets to de-emphasize a tag, reducing its influence without removing it entirely.

• Nesting Syntax: Nesting brackets reduces weight exponentially.

  • [keyword] = $0.9$ (Equivalent to (keyword:0.9))

  • [[keyword]] = $0.9 \times 0.9 = \mathbf{0.81}$

  • [[[keyword]]] = $0.9 \times 0.9 \times 0.9 = \mathbf{0.73}$

Quick Reference Table

Syntax	Type	Multiplier	Explicit Equivalent
(((keyword)))	Strong Emphasis	$1.33\times$	(keyword:1.33)
((keyword))	Medium Emphasis	$1.21\times$	(keyword:1.21)
(keyword)	Light Emphasis	$1.10\times$	(keyword:1.1)
keyword	Neutral	$1.00\times$	(keyword:1.0)
[keyword]	Light De-emphasis	$0.90\times$	(keyword:0.9)
[[keyword]]	Medium De-emphasis	$0.81\times$	(keyword:0.81)
[[[keyword]]]	Strong De-emphasis	$0.73\times$	(keyword:0.73)