Blur node

This documentation is for version 4.0 of Blur (net.sf.cimg.CImgBlur).

Description

Blur input stream or compute derivatives.

The blur filter can be a quasi-Gaussian, a Gaussian, a box, a triangle or a quadratic filter.

Note that the Gaussian filter [1] is implemented as an IIR (infinite impulse response) filter [2][3], whereas most compositing software implement the Gaussian as a FIR (finite impulse response) filter by cropping the Gaussian impulse response. Consequently, when blurring a white dot on black background, it produces very small values very far away from the dot. The quasi-Gaussian filter is also IIR.

A very common process in compositing to expand colors on the edge of a matte is to use the premult-blur-unpremult combination [4][5]. The very small values produced by the IIR Gaussian filter produce undesirable artifacts after unpremult. For this process, the FIR quadratic filter (or the faster triangle or box filters) should be preferred over the IIR Gaussian filter.

References:

[1] https://en.wikipedia.org/wiki/Gaussian_filter

[2] I.T. Young, L.J. van Vliet, M. van Ginkel, Recursive Gabor filtering. IEEE Trans. Sig. Proc., vol. 50, pp. 2799-2805, 2002. (this is an improvement over Young-Van Vliet, Sig. Proc. 44, 1995)

[3] B. Triggs and M. Sdika. Boundary conditions for Young-van Vliet recursive filtering. IEEE Trans. Signal Processing, vol. 54, pp. 2365-2367, 2006.

[4] Nuke Expand Edges or how to get rid of outlines. http://franzbrandstaetter.com/?p=452

[5] Colour Smear for Nuke. http://richardfrazer.com/tools-tutorials/colour-smear-for-nuke/

Uses the ‘vanvliet’ and ‘deriche’ functions from the CImg library.

CImg is a free, open-source library distributed under the CeCILL-C (close to the GNU LGPL) or CeCILL (compatible with the GNU GPL) licenses. It can be used in commercial applications (see http://cimg.eu).

Inputs

Input	Description	Optional
Source		No
Mask		Yes

Controls

Parameter / script name	Type	Default	Function
Size / size	Double	x: 0 y: 0	Size (diameter) of the filter kernel, in pixel units (>=0). The standard deviation of the corresponding Gaussian is size/2.4. No blur is applied if size < 0.24 (Gaussian and quasi-Gaussian) or <= 1 (box, triangle and quadratic).
Uniform / uniform	Boolean	Off	Apply the same amount of blur on X and Y.
X derivation order / orderX	Integer	0	Derivation order in the X direction. (orderX=0,orderY=0) does smoothing, (orderX=1,orderY=0) computes the X component of the image gradient.
Y derivation order / orderY	Integer	0	Derivation order in the Y direction. (orderX=0,orderY=0) does smoothing, (orderX=0,orderY=1) computes the X component of the image gradient.
Border Conditions / boundary	Choice	Black	Specifies how pixel values are computed out of the image domain. This mostly affects values at the boundary of the image. If the image represents intensities, Nearest (Neumann) conditions should be used. If the image represents gradients or derivatives, Black (Dirichlet) boundary conditions should be used. Black (black): Dirichlet boundary condition: pixel values out of the image domain are zero. Nearest (nearest): Neumann boundary condition: pixel values out of the image domain are those of the closest pixel location in the image domain.
Filter / filter	Choice	Gaussian	Bluring filter. The quasi-Gaussian filter should be appropriate in most cases. The Gaussian filter is more isotropic (its impulse response has rotational symmetry), but slower. Quasi-Gaussian (quasigaussian): Quasi-Gaussian filter (0-order recursive Deriche filter, faster) - IIR (infinite support / impulsional response). Gaussian (gaussian): Gaussian filter (Van Vliet recursive Gaussian filter, more isotropic, slower) - IIR (infinite support / impulsional response). Box (box): Box filter - FIR (finite support / impulsional response). Triangle (triangle): Triangle/tent filter - FIR (finite support / impulsional response). Quadratic (quadratic): Quadratic filter - FIR (finite support / impulsional response).
Expand RoD / expandRoD	Boolean	On	Expand the source region of definition by 1.5*size (3.6*sigma).
Crop To Format / cropToFormat	Boolean	On	If the source is inside the format and the effect extends it outside of the format, crop it to avoid unnecessary calculations. To avoid unwanted crops, only the borders that were inside of the format in the source clip will be cropped.
Alpha Threshold / alphaThreshold	Double	0	If this value is non-zero, any alpha value below this is set to zero. This is only useful for IIR filters (Gaussian and Quasi-Gaussian), which may produce alpha values very close to zero due to arithmetic precision. Remind that, in theory, a black image with a single white pixel should produce non-zero values everywhere, but a few VFX tricks rely on the fact that alpha should be zero far from the alpha edges (e.g. the premult-blur-unpremult trick to fill holes)). A threshold value of 0.003 is reasonable, and values between 0.001 and 0.01 are usually enough to remove these artifacts.
(Un)premult / premult	Boolean	Off	Divide the image by the alpha channel before processing, and re-multiply it afterwards. Use if the input images are premultiplied.
Invert Mask / maskInvert	Boolean	Off	When checked, the effect is fully applied where the mask is 0.
Mix / mix	Double	1	Mix factor between the original and the transformed image.