Imagick::whiteThresholdImage

(PECL imagick 2, PECL imagick 3)

Imagick::whiteThresholdImage — Force all pixels above the threshold into white

说明

public 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
PECL imagick 2.1.0	Now allows a string representing the color as a parameter. Previous versions allow only an ImagickPixel object.

示例

示例 #1 Imagick::whiteThresholdImage()

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

?>

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User Contributed Notes 1 note

down

elmer at web-axis dot net ¶

14 years ago

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();

?>

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