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 // 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