Apple MA261Z/A User Manual - Page 683

Filter Matte Choker Soft Edges Widescreen IX Result Usually used in conjunction with a keying filter to manipulate the edges of the key. The Edge Thin slider in the Matte Choker is often used instead of the Edge Thin slider in the keying filter because it can produce a more realistic result. When you use the Matte Choker, moving the Edge Thin slider to the right gradually eats into marginally keyed areas of a filter, eliminating fringe and smoothing out the edges of your matte. When you move the Edge Thin slider to the right, marginally keyed areas of a clip are expanded, spreading out the matte and filling in holes in your foreground image that may have been created by the keying filter you're using. Matte Chokers always appear after the keying filter in the Filters tab. Matte Chokers are also commonly used in groups. The first Matte Choker eliminates the fringing in the areas you want to key out, but may create holes in the foreground image. The second Matte Choker, applied in reverse, fills in these holes to make the foreground image as solid as possible. More Matte Chokers can further fine-tune your key. Blurs the four edges of the clip individually by the specified amount to create an old-fashioned vignetting effect. Each of the four edges of your clip can be individually adjusted using the Left, Right, Top, and Bottom sliders. The Dither and Gaussian checkboxes are used to modify the quality of the blurred edge, and the Invert checkbox allows you to toggle between masking out the edges and creating a hole in your image. Generates a widescreen matte in the clip to create a letterboxed image. The Type pop-up menu allows you to adjust the aspect ratio of the top and bottom mask using standard academy ratios. The Offset slider lets you move the affected clip up or down in order to display the area that's most important. The Border slider moves the top and bottom of the letterbox inward by up to ten pixels. The color controls allow you to specify a border color for the letterbox other than black, and a Feather Edges checkbox blurs the edges of the letterbox. Chapter 48 Video Filters 683