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Can you give us some context? What is the effect you are wanting to achieve? You have shown us one implementation but we don't know if this is what it should look like, how you want it to change when you scale, what you want to scale and how. 
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hrolsons

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More context and more details and maybe even some examples. What units are you using? &nbsp;What are the sizes or range of sizes for your &nbsp;target image and watermark? Is &nbsp;<a rel="ugc nofollow" target="_blank">photoresearch.com</a> &nbsp;a real website? &nbsp;Is that where you are keeping your examples.? 
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I basically just want the whole watermark: <pre><code class="code-1 nolinks" id="code-20-43331206-1">https://www.photographresearch.com/simple-shop/watermark.png
</code></pre>&nbsp;to show up on the image, regardless of the size of the original image. @d-glitch, yes, that is where I'm testing my examples.
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***Correction.&nbsp; <a rel="ugc nofollow" target="_blank">PhotographResearch.com</a>&nbsp;is where I'm testing.&nbsp; Not PhotoResearch.com
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You might be better off putting the center of your scaled watermark at the center of your image:<ol><li>Get the size of your image: &nbsp;Im_X by Im_Y</li><li>Get the size of your watermark: &nbsp;Wm_X by Wm_Y</li><li>Determine the scaling required. &nbsp;Either X or Y will dominate: &nbsp;&nbsp;<ul><li>For a square watermark on a portrait page<ul><li>Sc = (Im-X - Margin)/Wm_X &nbsp;would work</li></ul></li><li>Margin is optional &nbsp;</li></ul></li><li>Find the origin/insertion point for the watermark<ul><li>&nbsp;( Im_X - Sc· Wm_X)/2, &nbsp;Im_Y - Sc· Wm_Y)/2 )</li></ul></li></ol> 
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@d-glitch, so then where would I put Sc that is calculated? On this line of code? <pre><code class="code-1 nolinks" id="code-20-43331231-1">imagecopymerge($im, $stamp, imagesx($im) - $sx - $marge_right, imagesy($im) - $sy - $marge_bottom, 0, 0, imagesx($stamp), imagesy($stamp), 20;
</code></pre>
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Could you explain (in words) what that line of code is doing and what the various parameters mean? I don't see any obvious place to put a scaling parameter. You don't have to do everything in one line. &nbsp;In fact you probably shouldn't. While you are debugging, it is a good idea to separate the functions and examine the intermediate results. If you have a program that is working, even if it's not quite correct, it would be very help to show the results. 
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This is working: <pre><code class="code-10 nolinks" id="code-20-43331334-1">&lt;?php
// Load the stamp and the photo to apply the watermark to
$stamp = imagecreatefrompng('https://www.photographresearch.com/simple-shop/logo6.png');
$im = imagecreatefromjpeg('https://www.photographresearch.com/simple-shop/photo.jpg');

// Set the margins for the stamp and get the height/width of the stamp image
$marge_right = 0;
$marge_bottom = 0;
$sx = imagesx($stamp);
$sy = imagesy($stamp);

// Copy the stamp image onto our photo using the margin offsets and the photo 
// width to calculate positioning of the stamp. 
imagecopymerge($im, $stamp, imagesx($im) - $sx - $marge_right, imagesy($im) - $sy - $marge_bottom, 0, 0, imagesx($stamp), imagesy($stamp), 20);


// Output and free memory
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);

?&gt;
</code></pre> But doesn't show the whole logo, which should say <a rel="ugc nofollow" target="_blank">PhotoResearch.com</a>.
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I can't see the results of your processing. &nbsp;Is the logo the same as the watermark? Some of the logo/watermark is missing. &nbsp;You may need to make it smaller. &nbsp;I don't see anything in your code that does scaling. Can you print just the logo/watermark on a blank page the size of your target image?
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I must be going about his the wrong way.&nbsp; Let me think.
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@David Favor I'm getting close, using your method. &nbsp;Not quite centered though, yet. <pre><code class="code-10 nolinks" id="code-20-43331398-1">&lt;?php
&nbsp;&nbsp;&nbsp;$watermark = new Imagick('logo6.png');
&nbsp;&nbsp;&nbsp;$watermark-&gt;scaleImage(500,500,true);
&nbsp;&nbsp;&nbsp;$imageURL = new Imagick('actual.jpg');
&nbsp;&nbsp;&nbsp;$imageURL-&gt;scaleImage(500,500,true);

&nbsp;&nbsp;&nbsp;// Draw watermark on the image file with the given coordinates
&nbsp;&nbsp;&nbsp;$image-&gt;compositeImage($watermark, Imagick::COMPOSITE_OVER, 0, 0);

&nbsp;&nbsp;&nbsp;// Save image
&nbsp;&nbsp;&nbsp;$image-&gt;writeImage("myimage." . $imageURL-&gt;getImageFormat()); 
?&gt;
</code></pre>
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<div class="content wysiwyg-content fr-view">
I'm having trouble adjusting the scale of the watermark in the following code(it's zoomed in too much): <pre><code class="code-10 nolinks" id="code-10-29223087-1">&lt;?php // Load the stamp and the photo to apply the watermark to
$stamp = imagecreatefrompng('https://www.photographresearch.com/simple-shop/watermark.png');
$im = imagecreatefromjpeg('https://www.photographresearch.com/simple-shop/photo.jpg');

// Set the margins for the stamp and get the height/width of the stamp image
$marge_right = -100;
$marge_bottom = -100;
$sx = imagesx($stamp);
$sy = imagesy($stamp);

// Copy the stamp image onto our photo using the margin offsets and the photo 
// width to calculate positioning of the stamp. 
imagecopymerge($im, $stamp, imagesx($im) - $sx - $marge_right, imagesy($im) - $sy - $marge_bottom, 0, 0, imagesx($stamp), imagesy($stamp), 20);


// Output and free memory
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);

?&gt;
</code></pre>Can someone help me with the math so that the watermark and photo are the same proportions?
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I'm having trouble adjusting the scale of the watermark in the following code(it's zoomed in too much):
<?php
// Load the stamp and the photo to apply the watermark to
$stamp = imagecreatefrompng('https://www.photographresearch.com/simple-shop/watermark.png');
$im = imagecreatefromjpeg('https://www.photographresearch.com/simple-shop/photo.jpg');

// Set the margins for the stamp and get the height/width of the stamp image
$marge_right = -100;
$marge_bottom = -100;
$sx = imagesx($stamp);
$sy = imagesy($stamp);

// Copy the stamp image onto our photo using the margin offsets and the photo 
// width to calculate positioning of the stamp. 
imagecopymerge($im, $stamp, imagesx($im) - $sx - $marge_right, imagesy($im) - $sy - $marge_bottom, 0, 0, imagesx($stamp), imagesy($stamp), 20);


// Output and free memory
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);

?>
Can someone help me with the math so that the watermark and photo are the same proportions?

Adjust scale/proportion of watermark on image

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