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      <title>Bokeh Iwa</title>
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Bokeh Iwa

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● Overview

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This effect reproduces a camera lens blur. The RGB values of each layer will be converted
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to exposure values, then blurred using the Iris shape, and finally composed together.
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To achieve a faster processing time, a Fourier transformation is used to process the filter.
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● Input Port

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  • Iris : Connects the image to define the shape of the Iris. The image luminance
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    values will be used for the effect. If no image is connected to the Iris port, no calculation
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    will take place. It's possible to connect 8bit or 16bit RGBA images.
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  • Source [1~5] : Connects images for the layers. The order in which they are
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    connected here doesn't define the layer stacking order. If nothing is connected to any
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    Source port, no calculation will be performed.
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    ● Parameters

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    Common
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    • On-Focus Distance : If there's a layer in this position, it will look on focus and it will be
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      composed normally. 0 represents the camera position. (Range 0.0-1.0)
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    • Bokeh Amount : Maximum size of blur (in scene units). When the focus position and the
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      layer position are 1.0 away from each other and Bokeh Adjustment is 1, the Iris image is
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      enlarged until the width of this image reaches this value.
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    • Hardness : The gamma value of the film. Used to convert between RGB value and
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      exposure. This is equivalent to the increase in RGB value (0.0 to 1.0) when the exposure is
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      increased 10 times. The lower the value, the more the highlights are emphasized.
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      (Range 0.05-3.0)
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      Layers
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      • Premultiply : Check this box when connecting unpremultiplied material such as the ones
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        from DigiBook, etc. directly to this effect.
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      • Distance : The distance of the layer from the camera. The layer stacking order is
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        automatically sorted according to this value. (Range 0.0-1.0)
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      • Bokeh Adjustment : Bokeh size correction value. The size of the bokeh is multiplied by N,
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        keeping the order of layer stacking. If this value is 0, the layers will be composited normally
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        without blurring regardless of the distance of the layer. (Range 0.0-2.0)
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        ● Notes

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        • When rendering multiple frames, the Iris and the layers images, must be present within
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          the range of all frames to be rendered.
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        • This effect uses a lot of RAM.
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          ● License Information

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          • This effect uses an open source library called Kiss FFT for the Fourier transform.
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            <font size="-1"></font>
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            This is the BSD-style license for the KissFFT.
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            Copyright (c) 2003-2010 Mark Borgerding
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            All rights reserved.
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            Redistribution and use in source and binary forms, with or without modification, are permitted provided that
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            the following conditions are met:
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                * Redistributions of source code must retain the above copyright notice, this list of conditions and the following
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            disclaimer.
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                * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
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            following disclaimer in the documentation and/or other materials provided with the distribution.
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                * Neither the author nor the names of any contributors may be used to endorse or promote products derived
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            from this software without specific prior written permission.
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            THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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            EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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            OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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            SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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            SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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            OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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            HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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            OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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            SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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