Changes the value of individual pixels based on a threshold

# Imagick::thresholdImage

(PECL imagick 2, PECL imagick 3)

Imagick::thresholdImage — Changes the value of individual pixels based on a threshold

### Description

public Imagick::thresholdImage(float `$threshold`, int `$channel` = Imagick::CHANNEL_DEFAULT): bool

Changes the value of individual pixels based on the intensity of each pixel compared to threshold. The result is a high-contrast, two color image.

### Parameters

`threshold`

`channel`

### Return Values

Returns `true` on success.

### Examples

Example #1 Imagick::thresholdImage()

`<?php
function thresholdimage($imagePath, $threshold, $channel) {
$imagick = new \Imagick(realpath($imagePath));
$imagick->thresholdimage($threshold * \Imagick::getQuantum(), $channel);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>`
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