Blur
blur() applies a Gaussian blur.
Example
| Source | Sigma 5 |
|---|---|
 |
 |
<?php
use Alto\Image\Image;
Image::open('source-landscape.png')
->blur(5)
->save('blur.png');Options
| Option | Default | Use |
|---|---|---|
sigma |
1.0 |
Blur strength |
Edge cases
- Sigma must be finite and greater than zero.
- Large values cost more and remove more detail.
- Dimensions and alpha do not change.
Driver support
Imagick is exact. GD approximates sigma with repeated fixed-kernel passes.