Imagick::adaptiveSharpenImage
(PECL imagick 2.0.0)
Imagick::adaptiveSharpenImage — 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;
?>
