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PHP | Imagick linearStretchImage() Function
  • Last Updated : 08 Aug, 2019

The Imagick::linearStretchImage() function is an inbuilt function in PHP which is used to stretch with saturation the image intensity. The calculation of Imagick::linearStretchImage() function is carry by pixels multiples with blackPoint and whitePoint simultaneously.

Syntax:

bool Imagick::linearStretchImage( $blackPoint, $whitePoint )

Parameters: This function accepts two parameters as mentioned above and described below:

  • $blackPoint: This parameter holds the image black point.
  • $whitePoint: This parameter holds the image white point.

Return Value: This function returns TRUE on success FALSE on failure.

Below example illustrates the Imagick::linearStretchImage() function in PHP:



Program: This program uses Imagick::linearStretchImage() function to stretch with saturation the image intensity.




<?php
  
// Store the image into variable
$imagePath=
  
// Store the value of variables
$blackThreshold = 23;
$whiteThreshold = 45;
  
// Declare new Imagick object
$imagick = new \Imagick($imagePath);
    
// Calculate the pixels of image
$pixels = $imagick->getImageWidth() * $imagick->getImageHeight();
  
// Use linearStretchImage() function to stretches with
// saturation the image intensity
$imagick->linearStretchImage($blackThreshold * $pixels, $whiteThreshold * $pixels);
  
header("Content-Type: image/jpeg");
  
// Display the image
echo $imagick->getImageBlob();
  
?>

Output:

Reference: https://www.php.net/manual/en/imagick.linearstretchimage.php

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