The Depth Of Field Blur filter applies a blur gradient that can be used to simulate extreme depth of field and miniaturization effects, such as tilt shift.
This filter can be applied as a non-destructive, live filter. It can be accessed via the Layer menu, from the New Live Filter Layer category.
The following settings can be adjusted in the filter dialog:
The gradient stops determine the position and extent of the transition between the areas in sharp focus and those that are blurred.
The focus origin (A) defines the central point at which the image is kept completely in focus. Reposition the focus origin by dragging on the stop.
The inner lines (B) define the width of the area in focus. For the Tilt Shift mode these can be set independently by dragging each of the stops in turn, or, symmetrically by dragging one of the stops while holding the . The Elliptical mode always matches the shape of the inner lines to the outer lines so that only the width can be specified.
The outer lines (C) define the end of the blur transition. For the Tilt Shift mode, these can be set independently by dragging each of the stops in turn, or, symmetrically by dragging one of the stops while holding the . The Elliptical mode always sets the stops in pairs.
The transition areas (D) between the inner and outer lines are where the blurring gradually increases. The wider the lines, the more gradual the transition. The area on the outside of the lines has the filter applied at the full amount set by the Radius slider.
The angle of the filter can be changed by dragging the stops at an angle. Once the desired angle is achieved, holding the will temporarily lock the angle to allow for further adjustment of the width of the adjustment.