Imagick::whiteThresholdImage

(PECL imagick 2.0.0)

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

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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.

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threshold

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锟缴癸拷时锟斤拷锟斤拷 TRUE锟斤拷

锟斤拷锟斤拷锟斤拷志

锟芥本	说锟斤拷
2.1.0	Now allows a string representing the color as a parameter. Previous versions allow only an ImagickPixel object.

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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();
}

?>