Make a solid black image

In this question:

http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/Q_27291199.html#a36515211

Everything is working great with the solution, but the black image involved is still a manual task, so I have a new question:

Given a random image, called image.jpg, how would you read the width and height and create  a solid black image of the same width and height and save it as image_black.jpg
hrolsonsAsked:
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DerokorianConnect With a Mentor Commented:
<?php

list($width,$height) = getimagesize('image.jpg');
$blackimage = imagecreate($width,$height);
imagecolorallocate($blackimage,0,0,0);

imagejpeg($blackimage,'image_black.jpg');

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For more info:
http://www.php.net/imagecreate
http://www.php.net/getimagesize
http://www.php.net/imagecolorallocate
http://www.php.net/imagejpeg

HTH
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