Php/docs/imagick.contrastimage

• PHP Manual
• Imagick
• Change the contrast of the image

Imagick::contrastImage

(PECL imagick 2, PECL imagick 3)

Imagick::contrastImage — Change the contrast of the image

说明

public 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()

<?phpfunction contrastImage($imagePath, $contrastType) {    $imagick = new \Imagick(realpath($imagePath));    if ($contrastType != 2) {        $imagick->contrastImage($contrastType);    }    header("Content-Type: image/jpg");    echo $imagick->getImageBlob();}?>