Source
$default = imagecolorallocate($image, self::$erase_color[0], self::$erase_color[1], self::$erase_color[2]);
<?php
/*
** Copyright (C) 2001-2025 Zabbix SIA
**
** This program is free software: you can redistribute it and/or modify it under the terms of
** the GNU Affero General Public License as published by the Free Software Foundation, version 3.
**
** This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
** without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
** See the GNU Affero General Public License for more details.
**
** You should have received a copy of the GNU Affero General Public License along with this program.
** If not, see <https://www.gnu.org/licenses/>.
**/
/**
* Helper for image related operations.
*/
class CImageHelper {
/**
* Image compare threshold.
*
* @var integer
*/
protected static $threshold = 0;
/**
* Default color used to erase regions.
*
* @var array
*/
protected static $erase_color = [255, 0, 255];
/**
* Get image resource from image data string.
*
* @param string $data image data string
*
* @return resource
*
* @throws Exception on error
*/
public static function getImageResource($data) {
$image = @imagecreatefromstring($data);
if ($image === false) {
throw new Exception('Failed to load image.');
}
return $image;
}
/**
* Get image data string from image resource.
*
* @param resource $image image resource
*
* @return string
*/
public static function getImageString($image) {
ob_start();
imagepng($image);