Imagick::whiteThresholdImage

(PECL imagick 2, PECL imagick 3)

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

Descrizione

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.

Elenco dei parametri

threshold

Valori restituiti

Restituisce true in caso di successo.

Log delle modifiche

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

Esempi

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();
}

?>

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User Contributed Notes 1 note

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elmer at web-axis dot net ¶

15 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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