magento1_delete_images.php

<?php
require_once "app/Mage.php";
umask(0);
//  set current store to admin and turn on developer mode
Mage::app('admin');
Mage::setIsDeveloperMode(true);
// load product collection
$productCollection=Mage::getResourceModel('catalog/product_collection');
foreach($productCollection as $product){
echo $product->getId();
echo "<br/>";
         $MediaDir=Mage::getConfig()->getOptions()->getMediaDir();
        echo $MediaCatalogDir=$MediaDir .DS . 'catalog' . DS . 'product';
echo "<br/>";

$MediaGallery=Mage::getModel('catalog/product_attribute_media_api')->items($product->getId());
echo "<pre>";
print_r($MediaGallery);
echo "</pre>";
    foreach($MediaGallery as $eachImge){
        $MediaDir=Mage::getConfig()->getOptions()->getMediaDir();
        $MediaCatalogDir=$MediaDir .DS . 'catalog' . DS . 'product';
        $DirImagePath=str_replace("/",DS,$eachImge['file']);
        $DirImagePath=$DirImagePath;
        // remove file from server
        $io     = new Varien_Io_File();
         $io->rm($MediaCatalogDir.$DirImagePath);
		// remove product image association in db
        $remove=Mage::getModel('catalog/product_attribute_media_api')->remove($product->getId(),$eachImge['file']);
    }
}