EllisLab/CodeIgniter — pull request #3106 by linauror (2014-06-16 08:38:19+00:00)
Title: Update Image_lib.php

Only wm_x_transp and wm_y_transp greater than 0,function "imagecolortransparent" with execution.
Because in wm_type = overlay, wm_x_transp = 0, wm_y_transp = 0, the image have partially transparent.