PHP | Imagick previewImages() Function

Last Updated : 16 Jun, 2022

The Imagick::previewImages() function is an inbuilt function in PHP which is used to quickly pin-point appropriate parameters for image processing. It tiles 9 thumbnails of the specified image with an image processing operation applied at varying strengths. 

Syntax:

bool Imagick::previewImages( int $preview )

Parameters: This function accepts single parameter $preview which holds the preview type constants. Click here to get the list of preview type constants. 

Return Value: This function returns TRUE on success and FALSE on Error or Failure. 

Errors/Exceptions: It throws ImagickException while error occurred. 

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

Program: 

php 
<?php 

// Store the image source into variable
$imagePath =
"https://cdncontribute.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-9.png";

// Create new Imagick object
$imagick = new \Imagick($imagePath);

// Use previewImages() function
$imagick->previewImages(imagick::PREVIEW_EDGEDETECT);

header("Content-Type: image/png");

// Display output image
echo $imagick->getImageBlob();

?>

Output:

  

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

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