(PECL imagick 2, PECL imagick 3)
Imagick::blackThresholdImage — Forces all pixels below the threshold into black
Is like Imagick::thresholdImage() but forces all pixels below the threshold into black while leaving all pixels above the threshold unchanged.
threshold
The threshold below which everything turns black
Returns true
on success.
Version | Description |
---|---|
PECL imagick 2.1.0 | Now allows a string representing the color as a parameter. Previous versions allow only an ImagickPixel object. |
Example #1 Imagick::blackThresholdImage()
<?phpfunction blackThresholdImage($imagePath, $thresholdColor) { $imagick = new \Imagick(realpath($imagePath)); $imagick->blackthresholdimage($thresholdColor); header("Content-Type: image/jpg"); echo $imagick->getImageBlob();}?>