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PHP | Imagick blackThresholdImage() Function

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  • Last Updated : 26 Aug, 2019
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The Imagick::blackThresholdImage() function is an inbuilt function in PHP which forces all pixels below the threshold value into black while leaving all pixels above the threshold unchanged.


bool Imagick::blackThresholdImage( $threshold )

Parameters: This function accepts a single parameter $threshold which is mandatory. All the pixel value below threshold value which everything turns black.

Return Value: This function returns True on success.

Below program illustrates the Imagick::blackThresholdImage() function in PHP:


// Create an Imagick object
$imagick = new Imagick(
// Use blackthresholdimage function
$imagick->blackthresholdimage('rgb(127, 127, 127)');
header("Content-Type: image/jpg");
// Display the output image
echo $imagick->getImageBlob();


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