https://www.php.net/manual/uk/image.examples-watermark.php
PHP: Adding watermarks to images using alpha channels - Manual
Adding watermarks to images using alpha channels
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https://www.creativebloq.com/computer-arts/precision-masks-using-photoshop-cs6s-alpha-channels-4137490
Precision masks using Photoshop CS6's alpha channels | Creative Bloq
Apr 10, 2013 - The key to isolating a specific part of an image is to capture those pixels that help describe it. Paul Tysall shows you how with alpha channels
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