@otto where is watermark (text or image) on your images? I don't see anything. Without watermark it works, but after applying watermark to image - result, as i post here.
I was trying GD and Imagick (in xenforo settings) with same result. I attach original images, as you can see it is png files. I personally think that the problem related with transparent zone in image.
Hello, problem with watermark (version 2.3.0):
Original image:
Result after applying watermark (text watermark version, same problem with watermark image):
Linux 4.10.0-32-generic #36-Ubuntu SMP Tue Aug 8 12:10:06 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
PHP 7.0.22-0ubuntu0.17.04.1 (cli)...
+1
From my site:
Seems this problem only in images with light color (black and gray color is okay). Also this problem exist if i use only "Watermark Type Text" option, not watermark.
Please fix it as soon as possible.