File size: 4,464 Bytes
3dabe4a |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 |
# Negative Prompt Weight
This is a simple extension for the [Stable Diffusion Web UI](https://github.com/AUTOMATIC1111/stable-diffusion-webui), which allows users to adjust the overall weight of the negative prompt, allowing you to increase or decrease its effect in a new way.
## What Does It Do?
Here's a demonstration of how it can continously reduce the effect of the negative prompt from what you normally get (on the right, with weight 1.0) to nothing, as if the negative prompt was empty (on the left, with weight 0.0):
*Prompt: portrait of zimby anton fadeev cyborg propaganda poster*<br>
*Params: Steps: 30, Sampler: DPM++ SDE Karras, CFG scale: 7.5, Seed: 918, Size: 512x640, Model: deliberate_v2* <br>
*Negative Prompt: Male*
*Prompt: portrait of zimby anton fadeev cyborg propaganda poster*<br>
*Params: Steps: 30, Sampler: DPM++ SDE Karras, CFG scale: 7.5, Seed: 918, Size: 512x640, Model: deliberate_v2* <br>
*Negative Prompt: Female*
### Why Use This?
This method was originally intended for <b>decreasing</b> the effect of the negative prompt, which is very hard or at times impossible to do with the currently available methods like Better Prompting™, Attention/Emphasis (using the '(prompt:weight)' syntax), Prompt Editing (using the [prompt1:prompt2:when] syntax), etc. But you can also use it with values higher than 1 and it will boost your negative prompt in its own style (you might need to lower your CFG scale a bit if you do that).
Here is the first example compared to using the '(negative prompts: weight)' syntax (i.e. bottom row is (negative prompt:0),(negative prompt:0.25),etc.:
Please have a look at the examples in the [comparisons](https://github.com/muerrilla/stable-diffusion-NPW#more-comparisons-and-stuff) section if you want to know how it's different from using '(prompt:weight)' and check out the discussion [here](https://github.com/AUTOMATIC1111/stable-diffusion-webui/issues/9220) if you need more context.
## Installation
Open SD WebUI > Go to Extensions tab > Go to Available > Press the big button > Find 'Negative Prompt Weight' in the list > Click Install
Or manually clone this repo into your extensions folder:
`git clone "https://github.com/muerrilla/stable-diffusion-NPW" extensions/stable-diffusion-NPW`
## Usage
After installing, you can find the new parameter "Negative Prompt Weight" in the extentions area of txt2img and img2img tabs.
## More Comparisons and Stuff
Here are some comparisons between NPW and Attention/Emphasis. So, top row is using NPW and bottom row is using the (Negative Prompt: weight) syntax with the same weights.
```Prompts: a close up portrait of a cyberpunk [knight|lobster], [lobster| ] armour, cyberpunk!, fantasy, elegant, digital painting, artstation, concept art, matte, sharp focus, art by josan gonzalez```
```Params: Steps: 30, Sampler: DPM++ 2M Karras, CFG scale: 10, Seed: 6, Size: 512x640, Model: deliberate_v2```
*Negative Prompt: red*
*Negative Prompt: samurai pink cg*
*Negative Prompt: *custom TI embedding**
## How It's Done
At runtime a new learned conditioning tensor `empty_uncond` is made from an empty prompt. Then at every step, inside the denoiser callback, the scheduled `uncond` tensor of the denoiser (which is based on whatever prompt hijinks were passed to the parser) is lerped with the `empty_uncond` to weaken it's effect. The lerp function can instead be given a parameter bigger than 1, and it will boost the effect of the negative prompt like the CFG scale does for the positive.
|