5 Replies Latest reply on Jun 24, 2017 7:36 AM by Doc_Pit
      • 1. Re: Problem with halo in Gaussian blur
        olh21 Level 1

        I think this is the normal behavior of a gaussian blur.

        What you see is the blur of the persons extending beyond the actual mask.

        If you don't want that you should actually enlarge and feather the mask to mask the blurred area


        What people usually do is cut and paste the background on another layer, enable the transparency lock then blur not to have the blur polluted

        • 2. Re: Problem with halo in Gaussian blur
          olh21 Level 1

          The original layer

          Screen Shot 2017-06-23 at 23.26.59.png

          The mask

          Screen Shot 2017-06-23 at 23.26.26.png


          the blured layer :see how the blur extend in the mask area

          Screen Shot 2017-06-23 at 23.26.38.png



          the masked blured layer resulting in a halo arround


          Screen Shot 2017-06-23 at 23.25.52.png


          Another layer with no mask and transparency

          Screen Shot 2017-06-23 at 23.32.46.png


          The result of the blur : see the halo

          Screen Shot 2017-06-23 at 23.33.45.png



          With transparency lock : No halo


          Screen Shot 2017-06-23 at 23.33.31.png

          1 person found this helpful
          • 3. Re: Problem with halo in Gaussian blur
            olh21 Level 1

            if you try your solution duplicating the men you will have the same result


            So you have to use the transparency lock on the background hence not duplicate your three man like you said but the background with a transparent area were your three man stand and the transparency lock.


            I don't know no other way to achieve this result because you need the transparency lock

            • 4. Re: Problem with halo in Gaussian blur
              davescm Adobe Community Professional


              This is normal. The transparency lock shown by olh21 will work if the selection is hard , but any softness and you will still get a blur.


              The alternative is

              a. Select the subject (as you did)

              b. Put that selection as a mask on the upper layer (revealing selection)

              c. Apply the same selection to the lower layer and use content aware fill

              d. Apply  gaussian blur to the lower layer




              1 person found this helpful
              • 5. Re: Problem with halo in Gaussian blur
                Doc_Pit Level 1

                1) Want to thank those who replied.  I'm always impressed with the generosity of people in this forum who are so willing to donate their time and expertise to help others.  Thanks very much.

                2) Now that I think about it: Of course!  In blurring the entire image, of course I'm blurring the subject as well as the background.  If I then mask the subject, the blur will extend beyond the mask.  I missed the obvious.  I also learned about transparency lock.  I had no idea.


                Again, many thanks.