Final Cut Pro HD | H•O•T Hands-On Training [Electronic resources] نسخه متنی

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Final Cut Pro HD | H•O•T Hands-On Training [Electronic resources] - نسخه متنی

Larry Jordan

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3. Moving Images with Keyframes


In this exercise, you will learn how to move images around the frame using keyframes, and you'll learn how to create favorite motions. These techniques are used a lot in commercial work.

In this example, you are creating part of an opening title sequence where, during a long downhill run, a variety of images slide into and out of the frame. You can see the finished effect by playing Seq Keyframe finished. (You may need to render this before it plays.)


1.

Open Chapter 10 Lesson, if it isn't open already. Double-click Seq Keyframe start to load it into the Timeline.

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2.

Because there will be a number of images onscreen at once, give yourself some room to work by dragging down the horizontal double bar in the middle of the Timeline.

3.

Choose Sequence > Insert Tracks and add 4 new video tracks. Then, in the Canvas, turn on Image+Wireframe and Show Title Safe. These will help you to align the images. (If you've forgotten how to turn these on, refer back to the previous exercise.)

4.

Start by opening the Clips Exercise 3 bin and loading MCU to camera into the Viewer. (Notice that I've already added the In and Out to set the duration to 5:00, as well as two markers.)

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5.

Position your playhead at the beginning of the Timeline and edit the MCU to camera clip to V2 in the Timeline (remember to use the patch panel). Then double-click the clip on V2 to load it back into the Viewer. Click the Motion tab to select it and drag the Viewer wider so you can see the keyframe section on the right.

The light gray area in the keyframe section indicates the duration of the clip you are editing. Markers are pink and displayed at the top of the Motion tab.


NOTE | A Keyframe Review


Keyframes are essential to creating motion effects. Although they were introduced earlier in the book, here's a quick summary of what you need to know about keyframes, all in one place:

Definition:
A keyframe is a specific setting of a specific parameter at a specific point in time.

Description:
A keyframe is required whenever you want to make something move or change over time. They are very granular. In other words, a keyframe for one parameter (such as position) has no effect on a keyframe for a different parameter (such as color desaturation). In order for multiple things to happen at once, you need to add multiple keyframes. The minimum number of keyframes you need is two: one for the starting position and one for the ending position.

To create a keyframe:
Option+click with the Arrow tool where a keyframe does not exist, click the Keyframe button, click with the Pen tool, or press Ctrl+K.

To go to a keyframe:
Click the little left and right arrows on each side of the Keyframe button, press Shift+K (next keyframe), or press Option+K (previous keyframe).

To move a keyframe:
Grab it with the mouse and drag it.

To delete a keyframe:
Option+click the keyframe with the Arrow tool, click with the Pen (minus) tool, Option+click with the Pen (plus) tool, or place the playhead on the keyframe and click the Keyframe button.

6.

First, change the Scale to 40, and press Return, to shrink the image on V2.

7.

Press the Home key to go to the beginning of the clip in the Viewer. Set a keyframe at the beginning of the clip by clicking the Keyframe button for Center.

8.

Move the clip so that the lower-right corner of the clip is positioned on top of the lower-right corner of Action Safe. (If you can't move the clip, be sure Image+Wireframe is selected in the Canvas pop-up menu.)

[View full size image]

9.

As you move the clip, watch the coordinates change in the two Center boxes. You have positioned the clip correctly when the left box (showing the horizontal position) reads 180 and the right box (showing the vertical position) reads 120.

Because you want everyone at home to see your animation, you must make sure to keep everything contained inside Action Safe. If this were a sponsor's logo or phone number, you should keep it inside Title Safe.

10.

Because you were parked on a position keyframe when you moved the clip, the keyframe is automatically updated with the revised position of the clip.

Next, move 20 frames ahead, either by dragging the playhead or typing +20, and press Return. (You should be lined up with the marker.) Set a second keyframe for Center.

11.

Move to the end of the clip (press Shift+O), or drag the playhead. Personally, I like using Shift+O because that way I know I am on the last frame of the clip. Many times, the Viewer is so small, it's hard to tell precisely where the playhead is positioned. (Notice that the playhead is just inside the lighter-gray area, which indicates the duration of the clip.)

Set another center keyframe. (This is the third.)

12.

Move back from the end of the clip 30 frames. (Yup, you guessed it, type 30 and press Return.) Set another center keyframe.

Your two interior keyframes should line up with the markers.

OK, you've sized and moved the clip into its final position onscreen and set four keyframes that will move it into and out of position. Now, you need to set the first and last keyframe so the clip will slide into frame at the beginning, and slide out of frame at the end.


NOTE | Is All This Precision Really Necessary?


The difference between a good effect and one that makes you cringe to watch is in the details. If all I wanted to do was move one clip around the screen, I wouldn't be this precise.

However, in this case, you are creating a master movement that will be copied to multiple clips that will chase each other across the screen. The only way this effect will be believable is to concentrate on getting the details right as you build the effect. In other words, yes, precisely aligning clips and setting keyframes exactly is pretty much standard.

Oh, and a little planning wouldn't hurt, either.

13.

Zoom the Canvas back so the image size is 25%. Use the Window Scaling pop-up menu. (A large computer monitor may allow you to work at 50%. The results are the same.)

14.

Position the playhead at the beginning of the clip. Hold down the Shift key and, with the Arrow tool selected, drag the clip to the right until the left edge of the clip touches the right side of the main image. In other words, you dragged it offscreen right (Center coordinates 500, 120). You can type directly in the Center text boxes, if you need to correct your coordinates.

Holding down the Shift key makes sure the clip doesn't move vertically when you are dragging it.

15.

Move the playhead so it is parked on the last keyframe. Hold down the Shift key and drag the clip to the left until it is offscreen left (Center coordinates 500, 120).

16.

Since motion effects are real time, select the Timeline and position the playhead to the start of the sequence and play it.

Cool! The snowboard skids onto the screen in 20 frames. Glides for about 3 seconds, then dashes off in 30 framesall while the background boarder is kicking up some huge fantails.

Now what you need to do is duplicate all that effort into four more clips. The good news is that Final Cut makes that process easy.

17.

Select the V2 clip on the Timeline and position the playhead over the last marker (press Option+M).

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18.

Double-click Track Jump to load it into the Viewer. Adjust the patch panel so v1 (Source) connects to V3 (Destination). Do an Overwrite edit to edit the Track Jump clip to the Timeline (F10).

You stacked the two clips because, for a brief period, you have three images on the screen at the same time (including the clip on V1). You shifted the V3 clip downstream because, although it uses the same movement as the V2 clip, that movement does not occur at the same time, but slightly later, than the clip on V2.

These two concepts, stacking and staggering, are used all the time in creating motion effects. The markers help to position the clips, and they help me remember what it is that I am doing.

19.

On the Timeline, select MCU to camera, and choose Edit > Copy (or press Cmd+C). Select Track Jump and choose Edit > Paste Attributes (or press Option+V).

Uncheck Scale Attribute Times, check Basic Motion, and click OK.

20.

Play the sequence. Watch how all the position attributes of the first clip were copied into the second. This is looking better; the second clip almost pushes the first clip offscreen.

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21.

Double-click Flying to load it into the Viewer. Adjust the patch panel so v1 (Source) connects to V4 (Destination). Position the playhead to the last marker of the V3 clip and do an Overwrite edit to put the Flying clip on the Timeline (F10).

22.

This time, double-click MCU to camera and click the Motion tab to make it active. Choose Effects > Make Favorite Motion.

The motion path you created for MCU to camera is saved to the Effects > Favorites folder of the Browser, available to you whenever you need it. Like, um, now.

23.

Select the V4 clip (Flying) and choose Effects > Motion Favorites > MCU to camera (Motion).

24.

Play your sequence and watch how one clip chases the other off the screen.


NOTE | Paste Attributes vs. Favorite Motion


You've used two different ways to copy a motion from one clip to another: Paste Attributes and applying a Favorite Motion. Is there a difference? Yes, and they are significant.

Paste Attributes allows you to select which attributes you want to paste from the dialog. Favorite Motion pastes all motion attributes regardless.

More significant is the Scale Attribute Times option within Paste Attributes. Double-click Flying to load it into the Viewer and choose the Motion tab. Using the Zoom tool, zoom in on the second marker. See how the second set of keyframes doesn't line up precisely with the marker? They are early by two frames.

Chapter 6, "Trim Your Story," there was a reason for learning this shortcut. I use it constantly when working with effects.)

29.

Double-click the V5 clip to load it into the Viewer and remove the last two keyframes so the image doesn't start to move at the end of the sequence, and you are done.

30.

Play your sequence and compare it to Seq Keyframe finished.

What do you mean, they don't match? Oh. Well, yeah, they don't. I adjusted the timing of the keyframes in Flying to match the other clips, cropped the left and right edges of each of the moving images, then added a drop shadow. But you learned how to do that in Exercise 1. Add them again here and the two sequences match.

31.

Whew! Finished. That was a lot to cover. Save your work because you are going to use this project in the next lesson. Quit Final Cut if you need to take a break.



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