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Revision Date: 10 January 2016

Blur Effects

This sub-menu contains seven blur effects which are used to blur sections of an image.

Artistic Effects
Blur Effects

The following image will be used to demonstrate the Blur effects:

Original Image
Original Image

Note

The examples on this page show the effects being applied to an entire image. It is easy to restrict the adjustment to a sub-section of the image simply by making a selection.  If a selection is active when the effect is run, it will only be applied to the selected region. Areas outside of the active selection will remain unchanged.

Tip

The controls shown in the effect dialogs operate in much the same way; drag the indicator left, right or in a circular motion (for an angle control).  Typing in a numeric value in the text box or using the up/down arrows beside the text box also changes the current value.  The keyboard arrow keys can be used to alter the value of a control once it has the focus.
Multiple controls can be used in isolation or combination. If more than one is altered, the cumulative effect will be shown.

Effects Blurs Fragment icon Fragment

Copies or "fragments" of the image are superimposed over the original.  The specified number of copies (Fragment Count) are redrawn at a Distance and Rotation to the original location as specified in the dialog.

This blur can be useful when creating an unfocussed multi-viewed version of an image. The effect is not unlike modern interpretations of insect-like vision and could be used to fake "drunken" or "semi-conscious" vision.

Example - Effects > Blurs > Fragment

Effects > Blurs > Fragment

Effects Blurs Gaussian Blur icon Gaussian Blur

This blur applies the well known Gaussian blur formula to the image. The result is a defocusing blur in it's simplest sense.

Gaussian Blur has only one configurable parameter: Radius. This a measure of how widely and how strongly the effect is applied.

Example - Effects > Blurs > Gaussian Blur

Effects > Blurs > Gaussian Blur

Effects Blurs Motion Blur icon Motion Blur

This effect is useful for adding an illusion of motion to an image, as if a photograph had been taken while the subject was moving across the frame.

The Angle of apparent motion is configurable as is the Distance, which is a measure of how far the effect shifts the original pixels.

Example - Effects > Blurs > Motion Blur

Effects > Blurs > Motion Blur

Effects Blurs Radial Blur icon Radial Blur

This effect is similar to Motion Blur, except that the apparent movement is along a circular path instead of a linear path.

The Center shows where the effect will be interpreted from. Center is relocatable: use the double slider control or drag the cross hair in the thumbnail preview.

Example - Effects > Blurs > Radial Blur

Effects > Blurs > Radial Blur

Effects Blurs Surface Blur icon Surface Blur

This effect is used to reduce soft details or noise in an image while retaining most edge details and contrast. The result is a cleaner, simplified version of the original.

The Radius value determines the sample size. Larger samples will usually produce fewer details.
Threshold acts as a tolerance level. Low values will yield finer detail while higher values will lose more detail.

Example - Effects > Blurs > Surface Blur

Effects > Blurs > Surface Blur

Effects Blurs Unfocus icon Unfocus

This effect looks similar to Gaussian Blur, but it gives a more dreamy or "unfocused" look to the image. In mathematical terms, Unfocus applies a more uniform weighting to the pixels within the requested radius.

The effect has one parameter: Radius. This controls the strength of the effect.

Example - Effects > Blurs > Unfocus

Effects > Blurs > Unfocus

Effects Blurs Zoom Blur icon Zoom Blur

This effect gives the appearance of motion towards the image subject. The effect effectively mimics blurring in the 3rd dimension as if the viewer was rapidly closing in on the focal point.  Another way of looking at this effect is that it is Motion Blur applied outwards from a central point.

Zoom Amount controls the strength of the effect.

The Center shows where the effect will be interpreted from. Center is relocatable: use the double slider control or drag the cross hair in the thumbnail preview.

Example - Effects > Blurs > Zoom Blur

Effects > Blurs > Zoom Blur