🟢 SD Prompt Template Syntax
Basic Requirements for Prompt Input
It's best to use English descriptions, although some models are trained in Chinese, allowing for Chinese prompt inputs.
It is recommended to use English punctuation.
Use commas, periods, or even null characters (\0) to separate keywords, which can improve image quality.
Match prompt descriptions and image styles as closely as possible; avoid repeating similar descriptions.
Use negative prompts to eliminate negative effects in images.
Avoid using ambiguous words that have multiple meanings.
Avoid using connectors like "with" and "and".
Keep descriptions of poses as concise as possible.
Avoid overly long prompts; the weight of the prompt words decreases from the front to the back, so words placed especially at the back have minimal impact on the actual image generation.
Input Techniques
First, conceptualize what needs to be depicted; you can refer to dataset tags on websites like Danbooru.
Group similar prompt words together, using English commas as separators, arranged from most important to least important.
Template Example
(quality), (subject)(style), (action/scene), (artist), (filters)
(quality) represents the quality of the image, for instance, 'low res' combined with 'sticker' to leverage more datasets, '1girl' combined with 'high quality' to obtain high-quality images.
(subject) anchors the content of the image, a fundamental component of any prompt.
(style) is optional and pertains to the style of the image.
(action/scene) describes what the subject is doing and where.
(artist) can be the name of an artist or a production company.
(filters) are additional details. You can use terms related to artists, studios, photography, character names, styles, effects, etc.
Prompt Syntax
Weight Coefficients
(word) - Increases the weight by 1.1 times.
((word)) - Increases the weight by 1.21 times (= 1.1 * 1.1), multiplicative relationship.
[word] - Reduces the weight by 90.91%.
(word:1.5) - Increases the weight by 1.5 times.
(word:0.25) - Reduces the weight to 25% of the original.
\(word\) - Uses the literal meaning of () characters in the prompt.
When specifying weights numerically, you must use () brackets. If no numerical weight is specified, it is assumed to be 1.1.
> ( n ) = ( n : 1.1 )
> (( n )) = ( n : 1.21 )
> ((( n ))) = ( n : 1.331 )
> (((( n )))) = ( n : 1.4641 )
> ((((( n )))) = ( n : 1.61051 )
> (((((( n )))))) = ( n : 1.771561 )
Tag Replacement
You can start with one prompt and switch to another during generation. The basic syntax is:
[to:when] adds 'to' to the prompt after a specified number of steps.
[from::when] removes 'from' from the prompt after a specified number of steps.
[from:to:when] replaces 'from' with 'to' after a specified number of steps.
from and to are the prompts before and after the replacement, and when indicates the timing of the replacement.
If when is a number between 0 and 1, it refers to the percentage of steps at which the switch occurs. If it is a positive integer, it represents the literal number of steps.
Common Templates
Positive Prompt
Universal Quality Requirement
(masterpiece,best quality),
Negative Prompts
Avoid Poor Portraits
ugly, fat, obese, chubby, (((deformed))), [blurry], bad anatomy,disfigured, poorly drawn face, mutation, mutated, (extra_limb),(ugly), (poorly drawn hands fingers), messy drawing, morbid,mutilated, tranny, trans, trannsexual, [out of frame], (bad proportions),(poorly drawn body), (poorly drawn legs), worst quality, low quality,normal quality, text, censored, gown, latex, pencil,
Avoid Generating Watermarks and Text Content
lowres, bad anatomy, bad hands, text, error, missing fingers,extra digit, fewer digits, cropped, worst quality, low quality,normal quality, jpeg artifacts, signature, watermark, username, blurry,
General
lowres, bad anatomy, bad hands, text, error, missing fingers, extra digit, fewer digits, cropped, worst quality, low quality, normal quality, jpeg artifacts, signature, watermark, username, blurry,
Avoid Deformed Hands and Extra Hands
extra fingers,fused fingers,too many fingers,mutated hands,malformed limbs,
extra limbs,missing arms,poorly drawn hands,