Triggered in: System\Classes\ImageResizer.php

Enables post processing of resized images after they've been resized before the resizing process is finalized (ex. adding watermarks, further optimizing, etc)

Example usage:

Event::listen('system.resizer.afterResize', function ((\System\Classes\ImageResizer) $resizer, (string) $localTempPath) {
     // Get the resized image data
     $resizedImageContents = file_get_contents($localTempPath);

     // Post process the image
     $processedContents = TinyPNG::optimize($resizedImageContents);

     // Place the processed image in the correct location for the resizer to finish processing it
     file_put_contents($localTempPath, $processedContents);

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