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The blur special effects change the pixels of an image to soften them, smooth their edges, blend them, or create motion effects.
The Tune blur effect (Effects 
Blur Tune blur) lets you apply any of four blurring effects, which are represented by thumbnails, to an image. You can adjust the blur effect and preview the image with softer or sharper focus while you are editing it. The Tune blur filter lets you improve image quality or create exciting visual effects.
The Directional smooth effect smooths the regions of gradual change in an image while preserving edge detail and texture. You can use this filter to subtly blur the edges and surfaces of images without distorting the focus.
The Gaussian blur effect produces a hazy effect, blurring the focus of an image according to Gaussian distribution, which spreads the pixel information outward using bell-shaped curves. The effect can improve the quality of bitmaps with sharp edges. Move the Radius slider to adjust the intensity of the effect. The Gaussian Blur effect supports all color modes except Paletted and Black-and-White.
The Jaggy despeckle effect scatters colors in an image, creating a soft, blurred effect with minimal distortion. It is most effective for removing the jagged edges that can appear in line art or high-contrast images. The Jaggy despeckle effect is also a preset lens type.
The Low pass effect removes sharp edges and detail from an image, leaving smooth gradients and low-frequency areas. The higher the settings you specify, the more image detail is erased.
The Motion blur effect creates the illusion of movement in an image. You can specify the direction of movement.
The Radial blur effect creates a blurring effect in an image that spins around or radiates outward from a center point that you specify.
The Bokeh blur effect (Effects Blur Bokeh blur) lets you control the amount of blur applied to the outside of an editable area and adjust the transition between the area in focus and the blurred area.
The Smooth effect mutes the differences between adjacent pixels to smooth an image without losing detail. It is especially useful for removing the dithering that is created when you convert an image from the paletted mode to the RGB mode. The Smooth effect produces a more pronounced effect than the Soften effect. The Smooth effect is also a preset lens type.
The Soften effect smooths and tones down the harsh edges in an image without losing important image detail. The difference between the Smooth and Soften effects is subtle but is often apparent when images are viewed at high resolution. The Soften effect is also a preset lens type.
The Zoom effect blurs image pixels outward from a center point. The pixels closest to the center point are the least blurry.
The Smart blur effect (Effects Blur Smart blur) blurs an image but retains the edge detail. This effect is useful if you want to retain the sharp lines and edges, such as the ones that form the letters in text, when you export an image to a file format that would normally reduce the amount of detail. This effect is ideal for removing noise and artifacts from JPEG images.
The Smart blur effect smooths the surfaces while keeping the edges sharp.
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