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What is "Prompt Syntax" and why does it matter?

Prompt Syntax
refers to the rules and conventions that are used to structure and format prompts for AI image generation models
can include various elements, such as keywords, punctuation, and formatting conventions, that are used to convey specific instructions to the model
helps to ensure that the input to the model is well-defined and unambiguous so that the model can generate the desired output with a high degree of accuracy

This boils down to the fact, that not just what you write is important, but also how you write it. Let's dive right in and consider what that means for our prompts.



Order and Semicolons

Without any further semantics, the AI will prioritize whatever is written first. Therefore it is crucial to put the main theme and most important part of the image at the start.
After that should follow what else you want to see in the image followed by styles and artists. Semicolons help the AI (and you) to understand different sections. A recommended split would be:

"Main theme ; Adjectives ; Styles and Artists"



Sentences vs Keywords

A lot of community members have seen improvements in their prompts when using sentences instead of just keywords. This applies mostly to the main theme. I can personally confirm that this is the way 

Bad: "full body image, stealthy ninja, thieves guild, black ninja-outfit, standing in front of a red car ; ..."

Good: "full body image of a stealthy ninja from the thieves guild wearing a black ninja-outfit standing in front of a red car; ..."

Parenthesis and Exclamation Marks

Parentheses are used for two reasons:

The AI understands that two or more words belong together and it helps you connect things better, eg. (red car), (blue sky), otherwise the AI tends to apply these colors to everything or applies them at random. Note: This is not guaranteed to work, but I got some very good results using them for it.

The AI prioritizes what is in parenthesis, so put in them what you really need (or don't want in the negative prompt) - for single words you can also use exclamation marks. like 'blurry!!!!' in a negative prompt

The more brackets or exclamation marks, the more priority!

Warning: Be aware that overuse of exclamation marks can lead to increased size or overuse of that word (if it is a subject the AI can paint and not an adjective).



Let's say the AI keeps painting our ninja in red robes (because the word red is in there for the car, but not for the ninja).

"full body image of a (stealthy ninja) from the thieves guild wearing a (((black ninja-outfit)))!! standing in front of a (((red car))); ..."

In the negative prompt, we add: "(((red clothes)))!!!" at the beginning.

Takeaway: If you have any adjective (especially colors) anywhere in your positive prompt, connect it with parenthesis to the thing/object/theme/whatever you want it attached to!

Square Brackets

Apparently, those can be used to reduce priority. Let's say that red car would be nice to have, but isn't actually that important after all.... then we can do something like this:

"full body image of a (stealthy ninja) from the thieves guild wearing a (((black ninja-outfit)))!! standing in front of a [red car]; ..."

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