Dfx User Guide - Tiffen.com

302 Double Fog
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Vanishing Point
A vanishing point along the direction of increasing distance in the image is used
to add fog. By default, the vanishing point is set to the center of the screen.
Essentially, the fog is added in a radial pattern emanating from the vanishing
point. So at the default center position, fog is added in a circular pattern with a
greater amount of fog being added in the center while falling off at the edges.
For instance, if you would like your fog to move in the direction of top right to
bottom left, set your vanishing point towards the top right corner and the fog will
be more intense at the upper right and fall off at the bottom left. However, in
most cases, the vanishing point can be left in the center of the screen and you
will obtain acceptable results.
There is an on-screen control in the center of the image. By clicking and
dragging the on-screen control, the position of the vanishing point can be
adjusted.
Fog
Sets the amount of fog to be added to the scene.
Min Depth
Controls how much fog is added in the darker areas of the image.
Max Depth
Controls how much fog is added in the brighter areas of the image.
Glow
The Glow controls are used to add additional atmosphere and are useful in
adding glow to highlights. By default, a wide selection of highlights are glowed
in the image and blended with the Screen blend mode. This works well for
adding additional fog. To add glow around highlights such as light sources, it is
best to set the Blend mode to Add and lower the Selection > Range parameter
to limit the areas of glow to only include the light sources.
Blend
Determines the blend mode to be used to create the glow effect.
Dfx User Guide
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