Php/docs/imagick.whitethresholdimage

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• Imagick
• Force all pixels above the threshold into white

Imagick::whiteThresholdImage

(PECL imagick 2, PECL imagick 3)

Imagick::whiteThresholdImage — Force all pixels above the threshold into white

说明

public Imagick::whiteThresholdImage ( mixed $threshold ) : bool

Is like Imagick::ThresholdImage() but force all pixels above the threshold into white while leaving all pixels below the threshold unchanged.

参数

threshold

返回值

成功时返回 true。

更新日志

版本	说明
PECL imagick 2.1.0	Now allows a string representing the color as a parameter. Previous versions allow only an ImagickPixel object.

范例

Example #1 Imagick::whiteThresholdImage()

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