9 Replies Latest reply on Jan 11, 2012 4:26 PM by Chris Cox

    Photoshop lens blur: radius < 4 = no effect?

    tomaugerdotcom Level 1

      Why allow me to specify a radius < 4 if values below that will have no effect?

       

      Try it yourself: set up a Lens Blur with no other effects (brightness, DOF etc) and apply it to a duplicated layer. Now run difference between the two layers - all balck = no difference.

       

      Why can't I get more subtle values below 4?

       

      Same thing with Gaussian blur, though the threshold in that case is .25