PHP | Imagick randomThresholdImage() Function
Last Updated :
13 May, 2022
The Imagick::randomThresholdImage() function is an inbuilt function in PHP that is used to change the value of individual pixels based on the intensity of each pixel compared to the threshold. The result is a high-contrast, two-color image.
Syntax:
bool Imagick::randomThresholdImage( $low, $high, $channel )
Parameters: This function accepts three parameters as mentioned above and described below:
- $low: This parameter stores the value of the low point.
- $high: This parameter stores the value of the high point.
- $channel: This parameter provides the channel constant that is valid for channel mode. More than one channel can be combined using bitwise operator. The defaults channel in Imagick function is Imagick::CHANNEL_DEFAULT.
Return Value: This function returns True on success.
Original Image:
Below programs illustrate Imagick::randomThresholdImage() function in PHP:
Program 1:
PHP
<?php
header( 'Content-type: image/png' );
$image = new Imagick(
$image ->randomThresholdImage(0.3, 0.5, 5);
echo $image ;
?>
|
Output:
Program 2:
PHP
<?php
$string = "Computer Science portal for Geeks!" ;
$im = new Imagick();
$draw = new ImagickDraw();
$draw ->setFillColor( new ImagickPixel( 'green' ));
$draw ->setFontSize(50);
$matrix = $im ->queryFontMetrics( $draw , $string );
$draw ->annotation(0, 40, $string );
$im ->newImage( $matrix [ 'textWidth' ], $matrix [ 'textHeight' ],
new ImagickPixel( 'white' ));
$im ->drawImage( $draw );
$im ->randomThresholdImage(0.3, 0.5, 5);
$im ->setImageFormat( 'jpeg' );
header( "Content-Type: image/jpg" );
echo $im ->getImageBlob();
?>
|
Output:
Reference: http://php.net/manual/en/imagick.randomthresholdimage.php
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