Форум PHP

Ребята помогите пожалуйста

вот скрипт upload фото и watermark
<?php
//--------------------------------
// CREATE WATERMARK FUNCTION
//--------------------------------



define( 'WATERMARK_OVERLAY_IMAGE', 'watermark.png' );
define( 'WATERMARK_OVERLAY_OPACITY', 100 );
define( 'WATERMARK_OUTPUT_QUALITY', 90 );

function create_watermark( $source_file_path, $output_file_path )
{
list( $source_width, $source_height, $source_type ) = getimagesize( $source_file_path );

if ( $source_type === NULL )
{
return false;
}

switch ( $source_type )
{
case IMAGETYPE_GIF:
$source_gd_image = imagecreatefromgif( $source_file_path );
break;
case IMAGETYPE_JPEG:
$source_gd_image = imagecreatefromjpeg( $source_file_path );
break;
case IMAGETYPE_PNG:
$source_gd_image = imagecreatefrompng( $source_file_path );
break;
default:
return false;
}

$overlay_gd_image = imagecreatefrompng( WATERMARK_OVERLAY_IMAGE );
$overlay_width = imagesx( $overlay_gd_image );
$overlay_height = imagesy( $overlay_gd_image );

imagecopymerge(
$source_gd_image,
$overlay_gd_image,
$source_width - $overlay_width,
$source_height - $overlay_height,
0,
0,
$overlay_width,
$overlay_height,
WATERMARK_OVERLAY_OPACITY
);


imagejpeg( $source_gd_image, $output_file_path, WATERMARK_OUTPUT_QUALITY );

imagedestroy( $source_gd_image );
imagedestroy( $overlay_gd_image );
}

//--------------------------------
// FILE PROCESSING FUNCTION
//--------------------------------

define( 'UPLOADED_IMAGE_DESTINATION', 'originals/' );
define( 'PROCESSED_IMAGE_DESTINATION', 'images/' );

function process_image_upload( $Field )
{
$temp_file_path = $_FILES[ $Field ][ 'tmp_name' ];
$temp_file_name = $_FILES[ $Field ][ 'name' ];

list( , , $temp_type ) = getimagesize( $temp_file_path );

if ( $temp_type === NULL )
{
return false;
}

switch ( $temp_type )
{
case IMAGETYPE_GIF:
break;
case IMAGETYPE_JPEG:
break;
case IMAGETYPE_PNG:
break;
default:
return false;
}

$uploaded_file_path = UPLOADED_IMAGE_DESTINATION . $temp_file_name;
$processed_file_path = PROCESSED_IMAGE_DESTINATION . preg_replace( '/\\.[^\\.]+$/', '.jpg', $temp_file_name );

move_uploaded_file( $temp_file_path, $uploaded_file_path );

$result = create_watermark( $uploaded_file_path, $processed_file_path );

if ( $result === false )
{
return false;
}
else
{
return array( $uploaded_file_path, $processed_file_path );
}
}

//--------------------------------
// END OF FUNCTIONS
//--------------------------------

$result = process_image_upload( 'File1' );

if ( $result === false )
{
echo '';
echo '<br>An error occurred during file processing.';
echo '';
}
else
{
echo '';
echo '<br>Original image saved as <a href="' . $result[ 0 ] . '" target="_blank">' . $result[ 0 ] . '</a>';
echo '<br>Watermarked image saved as <a href="' . $result[ 1 ] . '" target="_blank">' . $result[ 1 ] . '</a>';
echo '';

}
?>
можна ли сделать так чтобы когда добавляю фото можна была уменьшить размер фото и поставить ограничении нап (1мб) и как сделать чтоб можна была менять места watermarkа y,x.