Php/docs/imagick.blackthresholdimage

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Imagick::blackThresholdImage

(PECL imagick 2, PECL imagick 3)

Imagick::blackThresholdImageForces all pixels below the threshold into black


说明

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

Is like Imagick::thresholdImage() but forces all pixels below the threshold into black while leaving all pixels above the threshold unchanged.


参数

threshold
The threshold below which everything turns black


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::blackThresholdImage()

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