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
- $threshold
返回值
成功时返回TRUE
。
更新日志
版本 | 说明 |
---|---|
2.1.0 | Now allows a string representing the color as a parameter. Previous versions allow only an ImagickPixel object. |
范例
Example #1 Imagick::whiteThresholdImage()
<?php function whiteThresholdImage($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(); ?>