Convert for Smart Filters just converts the layer to a smart object. If your selected layer is already a smart object then "Convert for Smart Filters" will be greyed out as there is no need for the conversion. Filters will just be applied to that smart object in the same way.
On the example you gave of the hand drawn circle with marquee - can you show a screenshot including the layers panel
Thanks for the reply Dave, unfortunately this isn't my question. I know smart objects very well (I have been using photoshop since 2002) Not bragging, I know there are many people way more advanced than I am, just want to give context that I am not a novice.
The issue is the option to apply smart filters to my smart objects or layers of any kind. I would typically just apply filters to smart objects previously and they would automatically work as smart filters, though to highlight the issue below I have shown the particular option that I am missing as well as my image settings to avoid any Bit/Channel or Color Mode advice.
What you are showing is normal.
See example below:
1. A single layer converted to smart object
2. At this stage the layer menu smart filter is greyed as no smart filter has been applied
3. If I go to the filter menu and use any filter (I've used Gaussian blur in this example) then the filter is applied as a smart filter
4. Now that a smart filter has been applied to the layer , the Smart filter sub menu is available in the layers menu
This was CC2017.1.1 but I've just checked and CS6 worked the same way
Thanks so much Dave.
Originally all filters, like Gaussian Blur, were greyed out as well. I think this may have had to do with the source files in the original file I was working with (exported from Maya at 16bit/channel then converted to 8bit/channel); and/or more likely not having the "show all filters "preference clicked (as indicated in other threads on here).
With the preference fix and a full machine restart, I see now that in my frustration rather than testing out the filters themselves I was just checking the tool bar dropdown menu. As you pointed out, having never used that dropdown menu before, I did not realize it only showed when a smart filter was already applied.
Short story long, I really appreciate your help and patience. My problem appears to be solved thanks to your clear reference of the function of the smart filters option in the dropdown menu.
No problem - we've all been there at times