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Edit File: MemoryDrawing.php

<?php

/**
 * PHPExcel_Worksheet_MemoryDrawing
 *
 * Copyright (c) 2006 - 2015 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel_Worksheet
 * @copyright  Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version    ##VERSION##, ##DATE##
 */
class PHPExcel_Worksheet_MemoryDrawing extends PHPExcel_Worksheet_BaseDrawing implements PHPExcel_IComparable
{
    /* Rendering functions */
    const RENDERING_DEFAULT = 'imagepng';
    const RENDERING_PNG     = 'imagepng';
    const RENDERING_GIF     = 'imagegif';
    const RENDERING_JPEG    = 'imagejpeg';

/* MIME types */
    const MIMETYPE_DEFAULT  = 'image/png';
    const MIMETYPE_PNG      = 'image/png';
    const MIMETYPE_GIF      = 'image/gif';
    const MIMETYPE_JPEG     = 'image/jpeg';

/**
     * Image resource
     *
     * @var resource
     */
    private $imageResource;

/**
     * Rendering function
     *
     * @var string
     */
    private $renderingFunction;

/**
     * Mime type
     *
     * @var string
     */
    private $mimeType;

/**
     * Unique name
     *
     * @var string
     */
    private $uniqueName;

/**
     * Create a new PHPExcel_Worksheet_MemoryDrawing
     */
    public function __construct()
    {
        // Initialise values
        $this->imageResource     = null;
        $this->renderingFunction = self::RENDERING_DEFAULT;
        $this->mimeType          = self::MIMETYPE_DEFAULT;
        $this->uniqueName        = md5(rand(0, 9999). time() . rand(0, 9999));

// Initialize parent
        parent::__construct();
    }

/**
     * Get image resource
     *
     * @return resource
     */
    public function getImageResource()
    {
        return $this->imageResource;
    }

/**
     * Set image resource
     *
     * @param    $value resource
     * @return PHPExcel_Worksheet_MemoryDrawing
     */
    public function setImageResource($value = null)
    {
        $this->imageResource = $value;

if (!is_null($this->imageResource)) {
            // Get width/height
            $this->width  = imagesx($this->imageResource);
            $this->height = imagesy($this->imageResource);
        }
        return $this;
    }

/**
     * Get rendering function
     *
     * @return string
     */
    public function getRenderingFunction()
    {
        return $this->renderingFunction;
    }

/**
     * Set rendering function
     *
     * @param string $value
     * @return PHPExcel_Worksheet_MemoryDrawing
     */
    public function setRenderingFunction($value = PHPExcel_Worksheet_MemoryDrawing::RENDERING_DEFAULT)
    {
        $this->renderingFunction = $value;
        return $this;
    }

/**
     * Get mime type
     *
     * @return string
     */
    public function getMimeType()
    {
        return $this->mimeType;
    }

/**
     * Set mime type
     *
     * @param string $value
     * @return PHPExcel_Worksheet_MemoryDrawing
     */
    public function setMimeType($value = PHPExcel_Worksheet_MemoryDrawing::MIMETYPE_DEFAULT)
    {
        $this->mimeType = $value;
        return $this;
    }

/**
     * Get indexed filename (using image index)
     *
     * @return string
     */
    public function getIndexedFilename()
    {
        $extension = strtolower($this->getMimeType());
        $extension = explode('/', $extension);
        $extension = $extension[1];

return $this->uniqueName . $this->getImageIndex() . '.' . $extension;
    }

/**
     * Get hash code
     *
     * @return string    Hash code
     */
    public function getHashCode()
    {
        return md5(
            $this->renderingFunction .
            $this->mimeType .
            $this->uniqueName .
            parent::getHashCode() .
            __CLASS__
        );
    }

/**
     * Implement PHP __clone to create a deep clone, not just a shallow copy.
     */
    public function __clone()
    {
        $vars = get_object_vars($this);
        foreach ($vars as $key => $value) {
            if (is_object($value)) {
                $this->$key = clone $value;
            } else {
                $this->$key = $value;
            }
        }
    }
}