PHPWales 2020 - June 3rd to June 4th

Imagick::whiteThresholdImage

(PECL imagick 2.0.0)

Imagick::whiteThresholdImageForce all pixels above the threshold into white

Descrição

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.

Parâmetros

threshold

Valor Retornado

Retorna TRUE no sucesso.

Changelog

Versão Descrição
2.1.0 Now allows a string representing the color as a parameter. Previous versions allow only an ImagickPixel object.

Exemplos

Exemplo #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
11 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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