Bitrix resize image IB. Ресайз изображений инфоблока. Например можно изменить размер картинки анонса у всех товаров. Скрипт пошаговый.

resize-image.php

<?php
require($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/prolog_before.php");

$iblockId = (int)$_REQUEST['iblock'];
$page = isset($_REQUEST['page']) ? (int)$_REQUEST['page'] : 1;
$pageSize = 70;
$isEnd = true;

if ($iblockId <= 0)
{
    ShowError('need define iblock id request');
}
else if (!$USER->IsAdmin())
{
    ShowError('access denied');
}
else if (!\Bitrix\Main\Loader::includeModule('iblock') && !\Bitrix\Main\Loader::includeModule('main'))
{
    ShowError('require iblock');
}
else
{
    $query = \CIBlockElement::GetList(
        array(
            'ID' => 'ASC'
        ),
        array(
            'IBLOCK_ID' => $iblockId,
        ),
        false,
        array(
            'iNumPage'  => $page,
            'nPageSize' => $pageSize
        ),
        array(
            'IBLOCK_ID',
            'ID',
            'PREVIEW_PICTURE',
            'DETAIL_PICTURE',
        )
    );

    $index = ($page - 1) * $pageSize;

    $el = new CIBlockElement();

    while ($item = $query->Fetch())
    {

//        $newPict = !$item['PREVIEW_PICTURE'] ? $item['DETAIL_PICTURE']: $item['PREVIEW_PICTURE'];
        $newPict = $item['DETAIL_PICTURE'];
        $newPictArr = CFile::GetFileArray($newPict);
        $src = CFile::MakeFileArray($newPictArr['SRC']);
        $src['COPY_FILE'] = 'Y';

        $res = $el->Update($item['ID'], array("PREVIEW_PICTURE" => $src),false,false,true);

        $index++;
    }



    $isEnd = ($index >= $query->SelectedRowsCount());
}

if ($isEnd)
{
    echo 'Ready!';
}
else
{
    $url = $APPLICATION->GetCurPageParam('page=' . ($page + 1), array('page'));

    echo 'Progress...';

    ?>
    <script>
        setTimeout(function() {
            window.location = <?= json_encode($url); ?>;
        }, 1000);
    </script>
    <?
}

require($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/epilog_after.php");