extensions/sd-webui-resharpen/README.md

# SD Webui ReSharpen
This is an Extension for the [Automatic1111 Webui](https://github.com/AUTOMATIC1111/stable-diffusion-webui), which allows you to increase or decrease the amount of *details* of the generation during the Stable Diffusion pipeline.

> **ie.** This is not just a postprocessing filter

## How to Use
There is simply a slider that controls the "sharpness" of the images, defaulting to 0.
- **Positive** values cause the images to be **noisy**
- **Negative** values cause the images to be **blurry**

> Though, don't actually use values too close 1 or -1 as it will become distorted

For `txt2img`, there is also a second slider for the `Hires. Fix` pass.
You can set positive for the normal pass and negative for the hr pass, or vice versa, for some interesting effects.

There is also now a scaling setting, allowing you to adjust the strength throughout the process *(**eg.** lower the sharpness towards the end)*.

> This Extension is disabled during the [ADetailer](https://github.com/Bing-su/adetailer) phase

**Note:** `Ancestral` samplers *(**eg.** `Euler a`)* do **not** work. Tested and confirmed to work for both `Euler` and `DPM++ 2M Karras`.

## Samples

<table>
    <thead align="center">
        <tr>
            <td>Sharpness</td>
            <td><b>-0.5</b></td>
            <td><b>-0.25</b></td>
            <td><b>0.0</b></td>
            <td><b>0.25</b></td>
            <td><b>0.5</b></td>
        </tr>
    </thead>
    <tbody align="center">
        <tr>
            <td>Result</td>
            <td><img src="samples\-05.jpg" width=128></td>
            <td><img src="samples\-025.jpg" width=128></td>
            <td><img src="samples\00.jpg" width=128></td>
            <td><img src="samples\025.jpg" width=128></td>
            <td><img src="samples\05.jpg" width=128></td>
        </tr>
    </tbody>
</table>

<p align="center">
<img src="samples/plot.jpg">
</p>

## How does it work?
I initially wrote this Extension to try speeding up the Diffusion process.
Since the latent noises gradually converges to around 0,
I tried to see if I can just add the delta between the current step and the previous step, perhaps multipled by a scaler,
to the current Tensor, in order to help it reaches 0 faster.
However, after fiddling around for a week, I still couldn't get it to consistently produce an actually better result.
So I gave up on the original idea.

Though in the process, I also found out this "sharpening" interaction. If I had to guess,
since the Diffusion is a denoising process, if I add the delta again, then it will overly denoise to create a blurry image;
if I subtract the delta, then it will basically add the noise back to create a noisy image.

## To Do
- [X] Generation InfoText
- [X] Pasting InfoText Support
- [X] X/Y/Z Plot Support
- [X] Scaling Support