Blur Layer

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About Blurs

Blur is a graphic effect that want to imitate an unfocused image. In a photography context it can be due to that the focus point of the lenses are not at the right position of the target of the photograph. Also blur can have other origins. Blurs can happen as the result of a poor exposition during its recording (to low exposure time for a high movement of the object or a high movement of the recorder). Also blurs occurs when you use a very open diaphragm (f4). In that case the objects that are out of the focus are very blurred compared to the situation where the diaphragm is fully closed (f22).

In a graphic context, blurs are effects that imitate those situations (with more or less success).

Specific Parameters

The specific parameters for Blur Layer are:



The Size parameter controls how big is the blur. Depending on that value the blur can have different effects. If you increase so much the blur value the render time increases a lot with the Size parameter.

This parameter is a compound value of two real numbers (x and y). Everyone indicate how big is the blur in its direction (x or y).

See the samples to get an idea of the variation on the sizes.


There are 5 types of blur in synfig:


Here there are some samples of Blurs.

Fast Gaussian

Fast Gaussian Blur
BlursFastGaussian.png Blurs2FastGaussian.png


Box Blur
BlurBox.png Blurs2Box.png

Cross Hatch

Cross Hatch Blur
BlurCrossHatch.png Blurs2CrossHatch.png


Disc Blur
BlurDisc.png Blurs2Disc.png


Gaussian Blur
BlurGaussian.png Blurs2Gaussian.png

Fast Gaussian Blur over all the layers

See also

  • Radial Blur with a radial control of the size of the blur.
  • Motion Blur a type of blur that is controlled by the movement of the object as well as the standard blur parameters.

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