Imagick::whiteThresholdImage()

(PECL imagick 2.0.0)

Force all pixels above the threshold into white

说明

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

范例

Example #1 Imagick::whiteThresholdImage()

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

Here's a example of this function:
<?php
 $img = new Imagick();
 $img->readImage($image_file_name);
 $img->whiteThresholdImage('grey');
 $img->writeImage($thumb_file_name);
 $img->clear();
 $img->destroy();
?>