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      <title>Bokeh Ref Iwa</title>
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Bokeh Ref Iwa

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● Overview

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This effect reproduces a camera lens blur. The input image is divided into several layers
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based on the gradation of the Depth reference image, and the RGB values of each divided
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layer are converted into exposure values, blurred using the Iris shape, and combined.
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Higher speed is achieved by using the discrete Fourier transform. Before blurring,
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a process of extending the parts of each layer that is hidden in the foreground with a
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Median filter is performed.
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● Input Port

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  • Iris : Connects the image to define the shape of the Iris. The image luminance values
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    will be used for the effect. If no image is connected to the Iris port, no calculation will
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    take place. It's possible to connect 8bit or 16bit RGBA images.
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  • Source : Connect the input image. If nothing is connected to the Source port, no
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    calculation is performed.
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  • Depth : Connect the Depth reference image. The brightness of each pixel corresponds
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    to the depth. The higher (brighter) the value, the farther away from the camera.
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    ● Parameters

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    • On-Focus Distance : If there's a layer in this position, it will look on focus and it will
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      be 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
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      the layer position are 1.0 away from each other, the Iris image is enlarged until the
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      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
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      is 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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    • Distance Precision : The number of divisions of the depth reference image. The larger
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      the value, the finer the gradation of the blur size, but the slower the processing.
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      (Range 3-128)
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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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