how to display original image from the folder for the post view page

i want to display the Original image instead of displaying cropped image..

<div class="white_box">
<div class="box-body">
<span class="hide WallHashID"><?php echo $wallpaper->wallpaper_hash; ?></span>
<?php $width = 620;
$height = 347; ?>

<div class="col-sm-12">
   <div class="wallpaper_image">
       <img class="thumbnail img-responsive"
            style="width:100%; height:auto; display:block; max-width:<?php echo $width; ?>px;max-height: <?php echo $height; ?>px;"
             src="<?php echo $this->image_workshop->crop_image(ORIGINALS_FOLDER_WF . '/' . $wallpaper->wallpaper_image_path, $width, $height, $wallpaper->wallpaper_crop_position, 'thumbnail'); ?>"
            alt="<?php echo $wallpaper->wallpaper_name; ?>">

</div>

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