Here's a simple way to resize your images based on a percentage.
<?php
$image_path = "images/your_image.png";
list($width, $height, $type, $attr)= getimagesize($image_path);
//specify what percentage you are resizing to
$percent_resizing = 80;
$new_width = round((($percent_resizing/100)*$width));
$new_height = round((($percent_resizing/100)*$height));
echo '<img src="'.$image_path.'" height="'.$new_height.'" width="'.$new_width.'">';
?>
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Manual Page -- http://www.php.net/manual/en/function.getimagesize.php
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