How can PHP prevent users from saving images in their original form after applying filters?

When users apply filters to images in PHP, the modified image is typically displayed on the webpage. However, users can still save the original image by right-clicking and selecting "Save image as." To prevent users from saving the original image, you can use PHP to create a temporary image file with the applied filters and serve that to the user instead of the original image. 

<?php
// Load the original image
$originalImage = imagecreatefromjpeg('original.jpg');

// Apply filters to the image (example: grayscale)
imagefilter($originalImage, IMG_FILTER_GRAYSCALE);

// Create a temporary image file with the filtered image
$tempImage = 'temp_image.jpg';
imagejpeg($originalImage, $tempImage);

// Output the temporary image to the browser
header('Content-Type: image/jpeg');
readfile($tempImage);

// Clean up - delete the temporary image file
unlink($tempImage);

// Free memory
imagedestroy($originalImage);
?>

Keywords

PHP image manipulation GD library image filters image processing

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