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      <title>Bokeh Iwa</title>

   Bokeh Iwa

● Overview

This effect reproduces a camera lens blur. The RGB values of each layer will be converted

to exposure values, then blurred using the Iris shape, and finally composed together.

To achieve a faster processing time, a Fourier transformation is used to process the filter.

● Input Port

Iris : Connects the image to define the shape of the Iris. The image luminance

values will be used for the effect. If no image is connected to the Iris port, no calculation

will take place. It's possible to connect 8bit or 16bit RGBA images.

Source [1～5] : Connects images for the layers. The order in which they are

connected here doesn't define the layer stacking order. If nothing is connected to any

Source port, no calculation will be performed.

● Parameters

Common

On-Focus Distance : If there's a layer in this position, it will look on focus and it will be

composed normally. 0 represents the camera position. (Range 0.0-1.0)

Bokeh Amount : Maximum size of blur (in scene units). When the focus position and the

layer position are 1.0 away from each other and Bokeh Adjustment is 1, the Iris image is

enlarged until the width of this image reaches this value.

Hardness : The gamma value of the film. Used to convert between RGB value and

exposure. This is equivalent to the increase in RGB value (0.0 to 1.0) when the exposure is

increased 10 times. The lower the value, the more the highlights are emphasized.

(Range 0.05-3.0)

Layers

Premultiply : Check this box when connecting unpremultiplied material such as the ones

from DigiBook, etc. directly to this effect.

Distance : The distance of the layer from the camera. The layer stacking order is

automatically sorted according to this value. (Range 0.0-1.0)

Bokeh Adjustment : Bokeh size correction value. The size of the bokeh is multiplied by N,

keeping the order of layer stacking. If this value is 0, the layers will be composited normally

without blurring regardless of the distance of the layer. (Range 0.0-2.0)

● Notes

When rendering multiple frames, the Iris and the layers images, must be present within

the range of all frames to be rendered.

This effect uses a lot of RAM.

● License Information

This effect uses an open source library called Kiss FFT for the Fourier transform.

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This is the BSD-style license for the KissFFT.

Copyright (c) 2003-2010 Mark Borgerding

All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that

the following conditions are met:

    * Redistributions of source code must retain the above copyright notice, this list of conditions and the following

disclaimer.

    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the

following disclaimer in the documentation and/or other materials provided with the distribution.

    * Neither the author nor the names of any contributors may be used to endorse or promote products derived

from this software without specific prior written permission.

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