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Imagick::contrastImage

(PECL imagick 2.0.0)

Imagick::contrastImageChange the contrast of the image

说明

Imagick::contrastImage ( bool $sharpen ) : bool

Enhances the intensity differences between the lighter and darker elements of the image. Set sharpen to a value other than 0 to increase the image contrast otherwise the contrast is reduced.

参数

sharpen

The sharpen value

返回值

成功时返回 TRUE

错误/异常

错误时抛出 ImagickException。

范例

Example #1 Imagick::contrastImage()

<?php
function contrastImage($imagePath$contrastType) {
    
$imagick = new \Imagick(realpath($imagePath));
    if (
$contrastType != 2) {
        
$imagick->contrastImage($contrastType);
    }

    
header("Content-Type: image/jpg");
    echo 
$imagick->getImageBlob();
}

?>

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