I have tested it with an RGB, 8bit, 4096 x 2732px file. I also get the same kind of bluriness, if I make a 3D postcard! Since lighting effects may also use a postcard internally, this problem is related.
BTW, the postcard blurriness is also there in CS6. The lighting effect bluriness is not in CS6. So maybe it ́s not related, as I thought before.
after lighting, with curves; and after lighting, but without curves. This area is within the hotspot. The other was just outside the hotspot, but within the cone of the spot light. I switched to a Point light, keeping all the settings the same. First shot is no light with curves. 2nd is Point light, but no curves (the curves were too strong).
And can someone please tell me why Smart Filters STILL has no obvious "well" for the visibility icon? I'm tired of stabbing at it when I want to turn it on and off. Even in this dim UI I can make out a square for layers visibility.
- Duplicate the layer to which you want to add lighting effects (ctrl+J)
- Go to the lighting effects filter (Filter > Render > Lighting Effects...)
- Apply lighting effects as desired, like you would normally do. Click OK when finished.
Lighting effects will be applied (albeit reducing image sharpness, but bear with me!)
- Toggle the top layer's visibility to off, hiding the lighting effects layer.
- Create a new layer (ctrl+shift+N)
- Press [shift+F5] to open the Fill dialogue box.
- Click the topmost dropdown menu labeled "Contents:" and select "50% Gray."
Make sure the blending mode is set to "Normal," opacity is at 100%, and "Preserve Transparency" is unchecked. Click OK. You should now have a medium-gray top layer.
- Press [alt+ctrl+F] to apply the last filter (in this case, Lighting Effects).
The same lighting effects settings you had applied in step 3 will be applied to the top gray layer.
- Finally, change the blend mode to either Overlay or Vivid Light, whichever one looks more appealing. This will blend the gray layer with the underlying visible layer, creating the same effect lighting effects normally would—except while retaining all of the original sharpness!
So there you have it. You may wish to compare the difference by toggling the visibility of the hidden lighting effects layer (alt-click the eye icon slot). If you zoom in to pixel level (ctrl+1), you will be able to see the stark difference between the two methods, and how this modified lighting effects method truly retained the image's original sharpness.