Imagick::adaptiveSharpenImage()
(PECL imagick 2.0.0)
Adaptively sharpen the image
说明
Imagick::adaptiveSharpenImage(float $radius,float $sigma[,int $channel= Imagick::CHANNEL_DEFAULT]): bool
Adaptively sharpen the image by sharpening more intensely near image edges and less intensely far from edges.此方法在Imagick基于ImageMagick 6.2.9以上版本编译时可用。
参数
- $radius
The radius of the Gaussian, in pixels, not counting the center pixel. Use 0 for auto-select.
- $sigma
The standard deviation of the Gaussian, in pixels.
- $channel
Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channel constants using bitwise operators.缺省为
Imagick::CHANNEL_DEFAULT
.参考此通道常数列表
返回值
成功时返回TRUE
。
范例
Example #1 A Imagick::adaptiveSharpenImage() example
Adaptively sharpen the image with radius 2 and sigma 1.
<?php try { $image = new Imagick('image.png'); $image->adaptiveSharpenImage(2,1); } catch(ImagickException $e) { echo 'Error: ' , $e->getMessage(); die(); } header('Content-type: image/png'); echo $image; ?>
参见
- Imagick::sharpenImage() Sharpens an image