Converging verticals

Discussion in 'Digital Cameras' started by Stewy, Oct 13, 2003.

  1. Stewy

    Stewy Guest

    I've recently been trying to correct converging verticals using Photoshop's
    Perspective crop but have sometimes come away with a picture that looks
    distinctively 'top heavy'.
    Are there any 'rules' about correcting verticals?
    Stewy, Oct 13, 2003
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  2. The reason is that the perspective is only "corrected" geometrically for a
    flat subject. The "depth perspective" is still the same, even though you're
    mimicking a more distant or elevated view.

    Perspective is caused by magnification differences due to distance, and
    normally a projection on a flat (sensor) surface. A more distant object will
    look smaller than a closer one of the same size, by a ratio determined by
    distance to the observer/camera lens.
    Since the distance in the PS adjusted version stays the same, the
    magnification ratio of overlapping or more distant objects stays unchanged
    which looks unnatural. Objects near the edges/corners will distort because
    of the projection on a flat sensor surface.

    If you want to reduce the unnatural/top-heavy impression, you can try and
    not fully correct the converging verticals. By leaving a small amount of
    natural convergence, the human visual system will like the image better.

    Bart van der Wolf, Oct 14, 2003
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