binho/php-thumb-library-watermark-plugin — pull request #1 by vigneshfone (2013-02-14 14:16:26+00:00)
Title: Update gd_watermark.inc.php

Added a parameter and an option to specify watermark image opacity.
$thumb->createWatermark($watermark, 10, 10,30);
You can specify image opacity in digits less than 100. 100 means no opacity and 50 applies 50% opacity to the image.