3 Replies Latest reply on Oct 25, 2012 9:23 AM by Mylenium

    Using Camera Lens Blur Filter / Mask


      I have a question concerning the lens blur and I hoping someone can point me to a good tutorial.


      I have several interview segments and I would like to do a small digital zoom at the end of each clip. The background is slightly out of focus already and it doesn't look natural to zoom when the bokeh is not changing.


      I have a good handle on the filter but I am not that experienced with advanced mattes. I need to learn how to get the matte on the person and stay during the zoom so I can manipulate the background. The subjects are seated on a stool so their is very little movement.


      Did some searches but I am probably not searching the right keywords. Can anyone point me in the right direction.



        • 1. Re: Using Camera Lens Blur Filter / Mask
          Mylenium Most Valuable Participant

          Not sure why you would actually want to fiddle with mattes beyond your primary keying/ mask. Any DOF is an illsuion in such a scenario and best controlled by using separate effects on ther layers involved. If you have a particular reason why you want to use Lensblur with an input buffer, perhaps a screenshot might help to explain...



          • 2. Re: Using Camera Lens Blur Filter / Mask
            millerjs68 Level 1

            I am not sure how to separate the layers.


            I have a subject in the foreground that I need to isolate into a separate layer and I am not sure how to do that considering the person is moving.


            I am not using the right terminology In video land we used to call it a traveling matte.


            I can't post the a pict because it is not my material. Will look for something similiar.



            • 3. Re: Using Camera Lens Blur Filter / Mask
              Mylenium Most Valuable Participant

              Masking? Rotsoscoping? I can think of a million ways to create separated layers or mattes and then duplicate the layer and invert the masks/ matte, but if you never have used that stuff before, you will hard-crash on concrete and not get very far, I'm afraid. It takes at least a bit of practice to produce a clean matte. As a palce to start you may get by suing the Rotobrush and see, if it produces clean enough edges, but if not, it's proably better to scrap the idea before eitehr ending up with a bad result or not meeting your deadline...