How to properly scale an image when adding an infoblock element?

Question

1C-Bitrix

I'm trying to change the size of the "PREVIEW_PICTURE" image when adding an infoblock element:

AddEventHandler('iblock', 'OnAfterIBlockElementAdd', 'OnAfterIBlockElementAddHandler');

function OnAfterIBlockElementAddHandler(&$arFields){
  CModule::IncludeModule('iblock');
  
  CAllFile::resizeImage(
    $arFields['PREVIEW_PICTURE'],
    ['width' => 405, 'height' => 300],
    BX_RESIZE_IMAGE_PROPORTIONAL
  );
}

The image remains unchanged. What am I doing wrong?

Answer 1

The question does not specify that it is a CSV import.
Need to tick

Answer 2

I need to save the result somewhere.

Answer 3

$arTmpImage = \CFile::ResizeImageGet(
            $itemPhoto["ID"],
            ["width" => 405, "height" => 300],
            BX_RESIZE_IMAGE_PROPORTIONAL, true,
            ["name" => "sharpen", "precision" => 100]
        );

You will understand further.