Autodesk 62205-051408-9001 User Guide - Page 570

21 Using Filters Box Blur Use Box Blur as a quick and effective method to create a blurring effect. The Box Blur changes the color value of each pixel based on the pixels next to it in the vertical and horizontal directions. It is fairly close to the look achieved using Gaussian Blur, but renders much faster. Use it when a faster rendering time is important, and the quality of the blur is less important. Radius-Varies the strength, or reach, of the blur filter. The radius is measured in pixels. Resize Image-Blurs outward from the edges of the layer giving the layer a soft edge. Channel Blur Use Channel Blur to blur each channel separately. You can blur the alpha channel, or create some unusual effects by adjusting the blur filter independently for each color channel. For example, blur the Blue channel to reduce grain, green to blur image detail, and red to reduce contrast. Red, Green, Blue, and Alpha-Sets the blur radius, in pixels, for each color channel. Undefined Areas-Sets the color to use to blur pixels at the edge of the image, or where the color channel is black. Resize Image-Extends the blur beyond the edge of the blurred layer. Compound Blur Use Compound Blur to create a blur based on the pixels of another channel, either in the same layer or from a different layer. In fact, the Compound Blur can be based on the output of any operator in the workspace. If you apply a Compound Blur based on luminance, the image is blurred where the pixel luminance is high, and it is not blurred where pixels are black. Layer-Displays the Operator Picker. Use this to select the footage whose pixels are used to set the amount of blur applied. Radius-Sets the blur strength. The Radius is measured in pixels. Channel-Determines which channel in the source layer is used to set the amount of blur applied. Blur Type-Determines whether the blur is a Box Blur or a Gaussian Blur. Constant Time Gaussian Blur Constant Time Gaussian Blur closely approximates Gaussian Blur, but at a faster speed. Since the required processing time is constant (does not vary depending on the radius size), speed improves significantly when using a large radius setting. Radius-Varies the amount of the blurring effect. The radius is measured in pixels. Resize Image-Blurs outward from the edges of the layer. Dolly Blur Use Dolly Blur to create a radial blur that increases outwards from a defined center point. By keyframing the blur radius, you can duplicate the effect of a blur created from a rapid camera dolly (camera moved towards or away from the subject). Amount-Sets the strength of the blur. The amount is measured as a percentage of the image. Center-Determines the point from which the blur radiates. The center is not blurred. You can use the Set Position button to set the center. Quality-Determines whether the effect is grainy or smooth. 554