Bokeh Ref Iwa
● Overview
This effect reproduces a camera lens blur. The input image is divided into several layers
based on the gradation of the Depth reference image, and the RGB values of each divided
layer are converted into exposure values, blurred using the Iris shape, and combined.
Higher speed is achieved by using the discrete Fourier transform. Before blurring,
a process of extending the parts of each layer that is hidden in the foreground with a
Median filter can be performed.
● 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 : Connect the input image. If nothing is connected to the Source port, no
calculation is performed.
- Depth : Connect the Depth reference image. The brightness of each pixel corresponds
to the depth. The higher (brighter) the value, the farther away from the camera.
● Parameters
- 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, 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)
- Distance Precision : The number of divisions of the depth reference image. The larger
the value, the finer the gradation of the blur size, but the slower the processing.
(Range 3-128)
- Fill Gap : Specifies whether to extend the further segmented layer pixels in order to fill gap.
- Use Median Filter : Specifies whether to use median filter for the extension.
This option is recommended when the depth is distributed discretely.
● 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.
This is the BSD-style license for the KissFFT.
Copyright (c) 2003-2010 Mark Borgerding
All rights reserved.
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