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