12 Replies Latest reply on Feb 26, 2014 5:44 PM by bdyomtov

    Lens Blur

    bdyomtov Level 1

      When I try to use lens blur on a selected area the filter seems to ignore the selection and blurs the whole image. Why is this?

       

      To be precise, for simplicity, I do the following:

       

      1. Open an image

      2. Convert background to layer 0.

      3. Select an area.

      4. Apply Lens blur

       

      The whole image then blurs.

       

      Note that if I do the same thing with Gaussian blur the blur is only applied to the selected area.

       

      What's going on?

       

      Thank you.

        • 1. Re: Lens Blur
          Noel Carboni Level 8

          Seems to work here on 14.2.1...

           

          LensBlurInAction.jpg

           

          Can you please post some screen grabs showing the problem, and also go into your Help - System Info menu, copy the info, and post it here.

           

          -Noel

          • 2. Re: Lens Blur
            Chuck Uebele Adobe Community Professional & MVP

            For lens blur, you want to create a alpha channel to be used as your selection.  Then when you apply your lens blur, you can use that alpha channel.  By clicking on the image in the lens blur dialog box, you can select which area of the alpha channel will be sharp.

             

            Here's a sample of using an Alpha Channel:

            lens blur.jpg

            1 person found this helpful
            • 3. Re: Lens Blur
              wes1 Level 1

              Try the Iris blur without making a selection first and see if that works.

              • 4. Re: Lens Blur
                bdyomtov Level 1

                Here are my steps. Notice that between 3 and 4 all I did was apply lens blur.

                 

                Step 1 - load image

                 

                Step 1.jpg

                Step 2 - select

                Step 2.jpg

                Step 3 - Invert selection

                Step 3.jpg

                 

                Step 4 - Aplly lens blur

                Step 4.jpg

                 

                Step 5 - deselect

                Step 5.jpg

                 

                System info:

                 

                Adobe Photoshop Version: 14.2 (14.2 20131211.r.515 2013/12/11:23:00:00) x64

                Operating System: Mac OS 10.8.5

                System architecture: Intel CPU Family:6, Model:26, Stepping:5 with MMX, SSE Integer, SSE FP, SSE2, SSE3, SSE4.1, SSE4.2, HyperThreading

                Physical processor count: 4

                Logical processor count: 8

                Processor speed: 2659 MHz

                Built-in memory: 10240 MB

                Free memory: 2549 MB

                Memory available to Photoshop: 9169 MB

                Memory used by Photoshop: 70 %

                Image tile size: 1024K

                Image cache levels: 4

                Font Preview: Medium

                TextComposer: Latin

                The GPU Sniffer crashed on 1/2/14 at 4:15:56 PM

                Display: 1

                Main Display

                Display Bounds: top=0, left=0, bottom=1200, right=1920

                OpenGL Drawing: Enabled.

                OpenGL Allow Old GPUs: Not Detected.

                OpenGL Drawing Mode: Basic

                OpenGL Allow Normal Mode: True.

                OpenGL Allow Advanced Mode: True.

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                gpu[0].OCLPresent=1

                gpu[0].OCLVersion="1.2 (Apr 25 2013 18:32:06)"

                gpu[0].CUDASupported=0

                License Type: Subscription

                Serial number: 96040026404182254700

                Application folder: /Applications/Adobe Photoshop CC/

                Photoshop scratch has async I/O enabled

                Scratch volume(s):

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                Primary Plug-ins folder: /Applications/Adobe Photoshop CC/Plug-ins/

                 

                 

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                • 5. Re: Lens Blur
                  bdyomtov Level 1

                  OK.

                   

                  I did that. I saved the selection and then used that channel as the "Depth Map." It blurred the unselected area rather than the selected. Then I backed up, clicked as you suggest, and reapplied the filter. Now the selected area got blurred, as the "Blur Focal Distance" went from 255 to 0. I assume this deals with how to handle gray areas in a mask somehow.

                   

                  Fine. I see, more or less, how it works now. Thank you very much.

                   

                  But is this explained anywhere? I couldn't find it, even in an Adobe video that purports to explain lens blur. Are we just supposed to figure it out through pain and suffering?

                  • 6. Re: Lens Blur
                    Noel Carboni Level 8

                    You may have marked an answer, but you absolutely should not have to make a special channel to use Lens Blur on a selection.

                     

                    If it is blurring pixels you do not have selected, then it is a bug - and apparently one not seen on all systems.

                     

                    Note:

                     

                    BeforeLensBlur.jpg

                     

                    AfterLensBlur.jpg

                     

                    -Noel

                    1 person found this helpful
                    • 7. Re: Lens Blur
                      bdyomtov Level 1

                      It's not clear why you reposted these two images, but as you can see from my images, it definitely blurs pixels I haven't selected.

                       

                      As far as I can tell, it needs (on my system anyway) to be told how to interpret the selection/alpha channel. Blur selected or unselected, black or white on a mask?

                       

                      I do find it strange.

                       

                      Is there a simple way to get Adobe to address it?

                      • 8. Re: Lens Blur
                        Noel Carboni Level 8

                        I posted the images to illustrate to you that what you tried to do is perfectly legitimate, and that you shouldn't have to do backflips to get Lens Blur to respect your selection (you did ask, "Are we just supposed to figure it out through pain and suffering?").

                         

                        As far as reporting it to Adobe, you've done about as well as you can by posting it here.

                         

                        Since a lot of things have been moved to the GPU lately, I wonder if recent changes by Adobe have uncovered a deficiency in your display driver...

                         

                        Here's something to try:

                         

                        1.  Go into your Performance preferences panel, and uncheck the [ ] Use Graphics Processor checkbox.

                        2.  Close Photoshop and restart it to ensure the setting change takes.

                        3.  Try the Lens Blur function again with a selection.

                         

                        If you find it to work now, then chances are something's amiss with your display driver.  We can discuss what to do next in that case.

                         

                        -Noel

                        1 person found this helpful
                        • 9. Re: Lens Blur
                          bdyomtov Level 1

                          Ok.

                           

                          I turned that off and it worked fine.

                           

                          I then turned it back on and it worked again.

                           

                          I believe my problem has to do with the "Depth Map" controls. If I hit "Layer Mask," as the source, which I may have done before, it seems to ignore the selection (there was no layer mask, of course). If I use "none," as I did on these two tests, the selection method works.

                           

                          That turns off the very confusingly named "Blur Focal Distance" slider and leaves it at zero. Apparently, if you use a layer mask, this slider somehow tells PS how far from the selected area the blur should be or something of that nature. So at zero it's right on it.

                           

                          When I turned the selection into a channel and then used that channel as the source of the depth map the slider came to life. When I moved it from zero to 255 the blur shifted from the selected to the unselected area. I suppose if I used the layer mask and put in some gray that would have an effect.

                           

                          Who knows. Certainly not a PS user who relies on Adobe for information.

                          • 10. Re: Lens Blur
                            bdyomtov Level 1

                            OK.

                             

                            So here's how it works.

                             

                            It needs a "Depth map." The layer mask provides that, with different shades apparently indicating different distances, from 0 to 255. The "Blur Focal Distance" then tells it what distance is in focus, with 255 for white areas on the mask and 0 for black areas. You can invert this. Seems to me it should just say "Focal Distance," with 0 being white, etc. That would be more intuitive, but what do I know?

                             

                            The "Radius" then adjusts the maximum blur. In effect, I think, it establishes the range of blurring, so if you want almost no depth of field you set it high so the black areas are really out of focus, and so on.

                             

                            Those are my guesses, anyway.

                            • 11. Re: Lens Blur
                              Chuck Uebele Adobe Community Professional & MVP

                              Thanks pretty much how it works.  Just wish they'd make this work with Smart Objects.  I like this filter a lot!

                              • 12. Re: Lens Blur
                                bdyomtov Level 1

                                Good. But why was it so hard to ferret this out?

                                 

                                Are you listening, Adobe? Are you listening, Photoshop book writers and the like?

                                 

                                Everyone is full of examples, vague discussions, and step-by-step instructions: "Now click on this and see how wonderful the image looks." But that's useless if you don't understand what you're doing.