Bulk Restore Images before Deactivating Plugin

Would appreciate advice or method to bulk restore my images to full size, before deactivating and deleting QuickWebP, due to WordPress error . . . In fact, I could not upload any new images, until I deactivated the plugin and cleared the cache. Originally, this plugin stated that it was compatible with WordPress 4.0.0 and higher, but the plugin developer recently changed that, after I pointed that fact out.

“WordPress caught an error with one of your plugins, QuickWebP – Compress / Optimize Images & Convert WebP | SEO Friendly”

The function that creates the error is the wp_getimagesize() function

The function that creates the error is the wp_getimagesize() function

Error Details

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An error of type E_ERROR was caused in line 130 of the file /home4/cassidy4/public_html/wp-content/plugins/quickwebp/admin/class-image-optimizer.php. Error message: Uncaught Error: Call to undefined function wp_getimagesize() in /home4/cassidy4/public_html/wp-content/plugins/quickwebp/admin/class-image-optimizer.php:130

Stack trace:

#0 /home4/cassidy4/public_html/wp-content/plugins/quickwebp/admin/class-image-optimizer.php(61): Quickwebp_Image_Optimizer->file_is_image(Array, Array)

#1 /home4/cassidy4/public_html/wp-includes/class-wp-hook.php(287): Quickwebp_Image_Optimizer->image_optimizition(Array)

#2 /home4/cassidy4/public_html/wp-includes/plugin.php(206): WP_Hook->apply_filters(Array, Array)

#3 /home4/cassidy4/public_html/wp-admin/includes/file.php(754): apply_filters('wp_handle_uploa...', Array)

#4 /home4/cassidy4/public_html/wp-admin/includes/file.php(987): _wp_handle_upload(Array, Array, NULL, 'wp_handle_uploa...')

#5 /home4/cassidy4/public_html/wp-admin/includes/class-file-upload-upgrader.php(65): wp_handle_upload(Array, Array)

#6 /home4/cassidy4/public_html/wp-admin/update.php(154): File_Upload_Upgrader->__construct('pluginzip', 'package')

#7 {main}

  thrown

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