Video Filters


Video filters are generally used to create more utilitarian effects to clips in your sequence, although design-oriented filters are included in this category as well.

Blink blinks the clip on and off. The frequency of the flashing can be adjusted independently with the On and Off duration sliders. You can also adjust the off duration's opacity. Used slightly, this effect can look sort of like a flashing of an old movie not quite registered.

De- Interlace can be used to remove either the upper (odd) or lower (even) field from an interlaced video clip. A pop-up menu allows you to remove either the upper or lower field. The remaining fields are interpolated to create a whole image, with marginal softening of the image as the result. The De-Interlace filter is useful when you want to create a still image from interlaced video clips of people or objects moving at high speed. Because each frame of video is a combination of two interlaced fields created sequentially over time, this can result in a flickering image. Another use of the De-Interlace filter is if you're outputting a QuickTime movie for computer playback or for streaming over the web. Interlacing can cause your video to have "banding" artifacts, which the De-Interlace filter can remove. This filter can also be used to eliminate flickering caused by interlacing in still frames, which have thin vertical lines, such as title pages with small text. However, the trade-off is that this effect reduces vertical resolution by half. Deinterlace upper on one track, deinterlace lower on an upper track, and set the upper track to 50% opacity to create progressive frames without losing resolution.

Flicker Filter reduces the flicker in images. This filter uses a vertical softening technique. You can adjust the amount using a pop-up menu. The different levelsMinimal, Medium, and Maxallow you to make the trade-off between flicker reduction and the amount of softness it applies. Flicker caused by still frames can be improved, as well as small letters in titles. This filter also works with scrolling titles to reduce flicker. It's also very useful when you're panning across images that have fine detail or horizontal lines (such as sheet music).

Image Stabilizer stabilizes motion in a clip that was handheld or that is shaking for some other reason. The Source pop-up menu allows you to view the clip before and after image stabilization has been applied. The Center control allows you to select a particular element in your video clip to use as the target for stabilization. The selected target should be a high-contrast element with a clearly defined shape. The Scan Range slider allows you to define the area of your clip that will be analyzed to track the motion of the selected target. Clips with greater motion should use a larger scan range; clips with more-subtle motion can use a smaller one. The Show Scan check box shows and hides the image stabilization target.

Stop Motion Blur blends frames within the clip. It sort of superimposes adjacent frames within each frame. This filter can be used to simulate the POV of a person under the influence of drugs or alcohol. It might also be useful for a time-warping sort of effect, because that is what it doestakes frames from earlier or later in the clip and superimposes them on current frames. You can adjust the time, steps, opacity, and operation used to blend the frames.

Strobe lowers a clip's visual frame rate by freezing the clip's frames for a selected amount of time. The Strobe Duration slider allows you to select the duration of each freeze frame. This filter is like a series of freeze frames that are sampled from the original video clip.

Timecode Print displays a clip's timecode to create a "window burn." You can adjust the timecode and the effect's look. This can be used to create a timecoded window burn of VHS approval copies of your work for a client's approval. If you nest your entire sequence in a new sequence, and then apply this filter to the nest, you can create a window burn that matches the timecode of your sequence. You then can make the changes noted by your client by timecode. This effect makes it easier to find specific areas to change. Timecode Print can also be used for all sorts of count-up and countdown effects. Crop and use just the numbers you need. Apply this effect to a slug that is as long as the event you want to time.

View Finder displays a viewfinder overlay much the same as you might find in a camera's viewfinder. Familiar elements can be included, such as record/play/pause mode, and even custom text, title/action safe, and a blinking lamp. You can adjust the text's color and mode as well.

Jerry Hofmann on Final Cut Pro 4
Jerry Hofmann on Final Cut Pro 4
ISBN: 735712816
Year: 2005
Pages: 189 © 2008-2017.
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