[[+image]] displays not the path to the file, but the request already generated through the connector using phpthumb parameters:
/ assets/components/gallery / connector.php?action=web / phpthumb&ctx=web&w=500&h=500&zc=0&far=&q=90&src=%2Fassets%2Fgallery%2F1%2F1.PNG
Accordingly, if you use pThumb that he should be fed only the path of the file that is in the tank is displayed by the placeholder [[+image_absolute]]:
<< < a href="[[+image_absolute:pthumb=`fltr[]=wmi|/assets/tpl/img/watermark.png|BR|70|5|5|0`]]" rel= "colorbox" title= " [[+name]]">
<img class=" [[+imgCls]] "src=" [[+thumbnail]] "alt=" [[+name]]" / >
</a>
Alternatively, use in the challenge Gallery image Properties parameter, where you specify the right query parameters in JSON format:
&&image Properties= ' {"for []": "my|/assets/tpl/img/watermark.png|BR|70|5|5|0"}`
Then, of course, and put a placeholder [[+image]] and thumb not needed
