Imagick::whiteThresholdImage

(PECL imagick 2, PECL imagick 3)

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

Description

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.

Parameters

threshold

Return Values

Returns true on success.

Changelog

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

Examples

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

down

elmer at web-axis dot net ¶

16 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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