FilmoraPro Video Editor

Create video stories with professional video editing tools.

Blurs Effects

There are several options available in the FilmoraPro to achieve a blur effect.

apply blurs effects in filmorapro

NB: Some blur tools have a Clamp to Edge function with is used to smoothen the product of the blur by averaging colors of the pixels next to the solid edges.

Angle Blur

This tool blurs images in a specified angle which is ideal for illustration of fast actions.

hoe to apply blurs effects

  • Angle:  By adjusting the angle, you will be able to tell the path which the blur follows.
  • Length: Enables you control the strength of the blur
  • Clamp to Edge: By default, the blur effect calculation spreads across the edges of the image and may not look okay. But turning on "Clamp to edge" property, you can avoid this issue. 

filmorapro blurs effects


This is the standard blur. This is your choice of a blur if you need something quick because it almost always works without much tweaking.

change blurs effects

  • Radius: The radius specifies the strength of the blur which you can adjust. Increasing it increases the area that each pixel takes.
  • Iterations: This is essentially the number of times the blur function is run on the image. Running more iterations produces a more smooth and bigger blur.
  • Dimension: There are two options here, that is vertical or horizontal. You can choose either or even both to determine the path the blur takes.
  • Clamp to Edge: Like above, you almost always want to check this box to prevent the blurring effect from extending beyond the intended path.


A diffuse blur enables you to make part of an image or whole of it appear soft. It works by making a duplicate layer of the image, blending the two layers then merging them.

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  • Radius: This property allows you to adjust the region and intensity of the blur. Increasing it, makes the region bigger and more intense.
  • Opacity: Adjust this property to change the "Opaqueness" of the image. Reducing this property makes the image more transparent.

Motion Blur

Motion blur is used to create an illusion or effect of a moving object. It comes in two modes, the default and a custom mode. The default mode auto sets all the properties and some works well. However, to get more precise control over what you want to achieve, you need to use the custom mode and set some custom properties.

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Custom mode properties

  • Shutter Angle:  This is a representation of the quantity of motion blur you want to achieve. By increasing the shutter angle, you, in turn increase the motion blur. To compare with a real camera, it is the amount of time the shutter will open to see a particular frame. The larger the shutter angle, the more motion blur you’ll get. 
  • Shutter Phase: This represents the speed of the target object. Changing this value alters the blur especially before and after the specific object.
  • Samples: This property means how many samples the blur function will take into consideration to create the motion blur. Taking more samples would result in a more accurate motion blur but at the expense of processing time. You should start from a low value and increase this value until you attain a value that works for you.

Optical Flow

There are two sides to motion blur, the speed and the pattern of movement. The speed of a motion is determined by the amount of motion blur applied to it while optical flow determines how the object moves. Several settings ultimately alter the optical flow, these are window size, sigma, iterations, downsamples and "start downsample".

edit blurs effects

  • Window Size: This is the region that determines how big an area will the Optical flow function look for a patch. The function begins at the current pixel and moves around an area equivalent to the "window size" property until it finds the patch it is looking for. It then means that increasing this size makes it more likely to find the match
  • Sigma: This property is part of the tracking algorithm and acts like a correction factor that is applied to the motion blur function to transform it somehow. Now, you may need to play around with different values to find what works for you as a given sigma value may have positive effects in one situation but a negative one in another.
  • Iterations: This means how many times the function will go around the specified window size looking for a match. Increasing this value makes the function more accurate but at the cost of processing time.
  • Downsamples: For an accurate tracking algorithm the sample rate of the digital audio signals need to be reduced. This process is called downsampling and is achieved by changing the "downsamples" property. Downsampling leads to a lower bit rate that works better for the motion blur.
  • Start Downsample: As discussed above, noise is not good for motion blur and that is why the blur algorithm begins working with the "Downsample" value, not the full resolution image. The "start downsample" property increases the speed to attain the results at the expense of the accuracy of the result.

Radial Blur

free blurs effects

This blur produces the effect that the camera that captured this photo, was rotating while doing so. The amount of blur and the center of the blur can all be altered to finetune how the image is to look.

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  • Center Position: This is the location that acts as the center of the blur circle. You can change it manually using coordinates with 0,0 being the center of the image or by just clicking at the location of the image, where you want the center to be
  • Angle: By using this property, you can change the amount of blur applied. Increasing this angle results in a more intense blur effect.

Zoom Blur

zoom blurs effects

This blur effect is akin to the radial blur, but instead of the effect going circularly, it instead begins at the center and radiates outwards. It usually signifies that some movement occurred while the image was being captured.

how to add blurs effects to a video in filmorapro

  • Quality: A larger value of the quality property results in a more smooth result but may at times take more time to calculate.
  • Strength: This essentially alters the intensity of the blur. It does so by changing the difference distance between two pixels that are blurred.
  • Center Position: Like the Radial blur, this property changes the point at which the blur effect calculation starts. The default location is the center of the image denoted as coordinates 0,0. However, you can change this location at will either by entering the coordinates of the new location or by clicking on the intended location.

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