Imagick::whiteThresholdImage

    (PECL imagick 2, PECL imagick 3)

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

    说明

    publicImagick::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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