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if using JSPT not sure if watermark validation still using jomsocial code or not.
if still using jomsocial code, you need to edit:
/administrator/components/com_community/controllers/multiprofile.php at line 208 you will find this code
if( $width > 16 || $height > 16 )
please changing that value with what your needs. but if not works, you need to asking JSPT.