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();
$img->destroy();
?>
(PECL imagick 2, PECL imagick 3)
Imagick::whiteThresholdImage — Force all pixels above the threshold into white
Is like Imagick::ThresholdImage() but force all pixels above the threshold into white while leaving all pixels below the threshold unchanged.
threshold
成功时返回 true。
| 版本 | 说明 |
|---|---|
| PECL imagick 2.1.0 | Now allows a string representing the color as a parameter. Previous versions allow only an ImagickPixel object. |
Example #1 Imagick::whiteThresholdImage()
<?php
function whiteThresholdImage($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();
?>