Adobe 65021048 User Guide - Page 132

ADOBE PREMIERE PRO CS3 126 User Guide Another unwanted interlacing effect can arise from a mismatch between a clip's field dominance, and that of the project, for example from a clip with upper field dominance being used in a project using lower field dominance. When the field dominance is not matched, playback of the clip appears jerky. You can correct this problem by reversing the field dominance of the clip so that it will match that of the project. Note: Fields in a clip can become reversed from the state in which they were originally acquired if the video capture card used to capture the footage was set to the field dominance opposite that of the source device, if the editing or animation software that last rendered the clip had the field dominance set opposite that of the original clip, or if you set the clip to play backward. 1 Select a clip in the Timeline panel, and choose Clip > Video Options > Field Options. 2 Select Reverse Field Dominance to change the order in which the clip's fields play back. This option is useful when the field dominance of the clip doesn't match that of the project, or when you play a clip backward. 3 For Processing Options, select one of the following choices: None Doesn't apply any of the Processing Options. Selecting this option does not disable Reverse Field Dominance, if that option is checked. Interlace Consecutive Frames Converts each pair of consecutive progressive-scan (non-interlaced) frames into the two interlaced fields of a single frame. This also results in the clip running at twice its original frame rate. This option is useful for interlacing clips created by animation applications not capable of generating interlaced frames. Ideally, you could use it to convert 60-fps progressive-scan animations into 30-fps interlaced video. Always Deinterlace Converts interlaced fields into non-interlaced, progressive-scan, frames. This option is useful for clips you want to play in slow motion or in freeze frame. This option discards one field (retaining the dominant field specified for the project in the Fields setting in the Project Settings dialog box, General settings). Then it interpolates the missing lines based on the lines of the dominant field. Note: If you specified No Fields (Progressive Scan) for the Fields setting when you started your project, Always Deinterlace retains the upper field unless you also select Reverse Field Dominance, in which case it retains the lower field. Flicker Removal Prevents thin horizontal details in an image from flickering by slightly blurring the two fields together. An object as thin as one scan line flickers because it can appear only in every other field. This option blurs consecutive lines 50%; it does not deinterlace the clip. It is especially useful for graphics containing thin horizontal lines. 4 Click OK. To improve the appearance of video when the clip's speed is not 100%, turn on frame blending. Choose Clip > Video Options > Frame Blend. See also "Blend frames for smooth motion" on page 129 "Adjust project settings and presets" on page 23 View the total duration of selected clips 1 Make sure that the Info panel is visible. If it is not, choose Window > Info. April 1, 2008