I believe that I have the same question. The oil paint filter is an option (i.e., it's not grayed out) and I can go into it and change settings, but nothing happens. I have preview set. When I go into the Photoshop CC edit->preferences->performance window. I have Use Graphics Processor checked, but in Advanced Settings, Use OpenCL is grayed out. Is that a sign of what's the problem, i.e., my graphics card? Or, am I missing something? What else can I check?
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