Gaussian filter in Premiere pro

Question

I want to know the level of gaussian filter in Premiere pro. Normally, when I apply gaussian filter, I set 20, 50...and so on, but I would like to know the exact blur level used in vision research. For example, +1.00 D, +2.00 D or 6/5.3, 6/6. What the 20 means in Premiere? Is there anyone the exact value means?

Answer 1

Try dropping a Ramp effect on your clip, followed immediately by a Calculations effect. Swivel down Second Source in Calculations, and set Second Layer to Video 1 (or whatever layer your clip is on), bring the Second Layer Opacity up to 100%, and then play with the blending modes in the Calculations effect to achieve a look you like: I found Darken, Multiply and Hard Light to be most effective. You can adjust the Ramp effect's color and start/end points--the default black-to-white gradient is going to be most like an ND grad, but you can change the black color to something else in order to get a colored grad (ie. tobacco). When you tweak it to a look you like, select both effects and save as a preset to easily reapply the look.