https://github.com/ilyakurdyukov/gravityblur

Image smoothing algorithm.
https://github.com/ilyakurdyukov/gravityblur

blur image-processing web-assembly

Last synced: 2 months ago
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Image smoothing algorithm.

• Host: GitHub
• URL: https://github.com/ilyakurdyukov/gravityblur
• Owner: ilyakurdyukov
• License: lgpl-2.1
• Created: 2020-02-05T08:32:35.000Z (almost 5 years ago)
• Default Branch: master
• Last Pushed: 2020-02-28T09:30:54.000Z (almost 5 years ago)
• Last Synced: 2024-07-30T21:02:27.615Z (5 months ago)
• Topics: blur, image-processing, web-assembly
• Language: C
• Homepage:
• Size: 150 KB
• Stars: 9
• Watchers: 3
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Gravity Blur

This is an image smoothing algorithm inspired by [JPEG Quant Smooth](https://github.com/ilyakurdyukov/jpeg-quantsmooth). This is called *gravity blur* because the pixel values gravitate towards each other, the force of this *gravity* is inversely proportional to the distance between them.

This algorithm preserves sharp edges if the distance between pixel values on the sides of the edges is greater than *range*. With more iterations, it is not only smoothes the image, but can also make it look like CG art or poster.

The original project page is [here](https://github.com/ilyakurdyukov/gravityblur).

## WebAssembly

Web version available [here](https://ilyakurdyukov.github.io/gravityblur/).

Images are processed locally on your computer.

- Click the "Load" button or drag-n-drop image into the browser window. After processing is complete, you can save the result by clicking the "Save" button. You can edit the *filename* field before saving to change the image format (jpeg or png, JPEG images are saved at 100% quality). The *options* field is passed to the *wasm* code when you initiate a processing by loading a file.

## Usage

`gravblur [options] input.[png|jpg|jpeg] output.[png|jpg|jpeg]`

## Options

`-r, --range f` Gravity range (0-100)  

`-s, --sharp f` Sharpness (0-100)  

`-n, --niter n` Number of iterations (default is 3)  

`-R, --rgb` Process in RGB (default)  

`-Y, --yuv` Process in YUV  

`-S, --separate` Separate color components  

`-a, --alpha` Use alpha channel  

`-i, --info n` Print gravblur debug output: 0 - silent, 3 - all (default)  

## Examples

- Images 3x zoomed.

![](https://ilyakurdyukov.github.io/gravityblur/images/lena_orig.png)

![](https://ilyakurdyukov.github.io/gravityblur/images/lena_new.png)

## Buliding

If your system have *libjpeg* and *libpng* development packages installed, just type `make`.

Or you can specify their location with `LIBS` variable to `make`.