Imagick::sharpenImage()
(PECL imagick 2.0.0)
Sharpens an image
说明
Imagick::sharpenImage(float $radius,float $sigma[,int $channel= Imagick::CHANNEL_DEFAULT]): bool
Sharpens an image. We convolve the image with a Gaussian operator of the given radius and standard deviation(sigma). For reasonable results, the radius should be larger than sigma. Use a radius of 0 and Imagick::sharpenImage() selects a suitable radius for you.
参数
- $radius
- $sigma
- $channel
返回值
成功时返回TRUE
。
范例
Example #1 Imagick::sharpenImage()
<?php function sharpenImage($imagePath, $radius, $sigma, $channel) { $imagick = new \Imagick(realpath($imagePath)); $imagick->sharpenimage($radius, $sigma, $channel); header("Content-Type: image/jpg"); echo $imagick->getImageBlob(); } ?>