Tài iệu Photoshop cs5 by Dayley part 112 pot

Chapter 25: Video Editing Basics
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FIGURE 25.27
This is about one-fourth of the layers that are actually contained in this timeline.
Tip
If you are importing a fairly large number of images, using the first method of importing an image sequence
and then choosing Flatten Frames into Layers followed by Make Frames from Layers is a faster process then
importing the stack, and it achieves the same result.
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Trimming Video Layers
As you add new video layers to a project, you may find that you need to trim them. Trimming a
video layer consists of cutting the unwanted ends off the layer, leaving the rest of the video intact.
You can trim a layer in several ways—by manually dragging the layer duration bar or by using the
Animation (Timeline) menu options.
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Dragging the layer duration bar
The easiest and most rudimentary way to trim a layer is to drag the ends of the layer to the point
where you want the video to start or end. First, you need to place the current time indicator in the
place where you want to begin or end the clip. You probably can get to that spot just by your ini-
tial preview of your video clip. Then simply grab the end of the layer duration bar by clicking and
holding it as you drag it to the current time indicator. This isn’t a precise method, but it works well
for a preliminary trim. Figure 25.28 shows my attempt at lining up the layer duration bar and the
current time indicator.
FIGURE 25.28
Dragging the end of the Layer Duration Bar to trim it
When you drag the beginning of the layer to trim it, the layer doesn’t reposition itself at the begin-
ning of the document automatically. If you want your layer to start at the beginning of the docu-
ment, you can do one of two things: drag and drop the already trimmed layer to reposition it or
simply drag the untrimmed layer forward, moving it out of the beginning of the document. Place

the current time indicator at the beginning of the document so you can preview the video as you
are shoving it out of the document.
Trimming layers using the menu option
If you want to trim your video more precisely, move the current time indicator to the proper area
and select Trim Layer Start/End to Current Time. This trims the layer to the current time. Again,
this leaves the beginning of your layer at the current time indicator rather than at the beginning of
your document, as shown in Figure 25.29. This might be exactly what you wanted it to do, but if
you want the layer to start at the beginning of the document, you have one other choice.
Tip
You can move the current time indicator to the very frame you want to trim to by using the Select Next/
Previous Frame icons that are found in the playback controls at the bottom of the Animation panel.
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FIGURE 25.29
Using the Animation (Timeline) panel menu to trim the layer start or end to the current time leaves you
with a gap at the front of your video document.
Trimming the document duration to the work area
To change the document duration to the trimmed areas of your video, you can set the work area to
surround the video you want keep and choose Trim Document Duration to Current Work Area from
the Animation panel menu, as shown in Figure 25.30. This quickly and concisely crops your video
down to the size of your set work area. If you have only one video layer in your document, this is
probably your best option for trimming your video file. Figure 25.31 shows my trimmed video.
Caution
If you have more than one layer in your Animation (Timeline) panel, be aware that trimming the document
duration to the work area trims all your layers down to the work area. To prevent inadvertently trimming a
layer too short, be sure that all the video you want in your final product is contained inside the work area.
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FIGURE 25.30

Move the work area indicators to the beginning and end of the area to trim to.
Work area indicators
Looking at trimmed layers in the
Animation (Timeline) panel
When you start trimming, splitting, and moving layers in the timeline, the look of the layers
changes to help you visualize the edits you are making. This can be confusing until you get the
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hang of what all the different colors represent. In Figure 25.32, you can see that the layer duration
bar looks different, depending on whether content is available and if that content is visible.
FIGURE 25.31
Choose Trim Document Duration to Current Work Area from the Animation panel menu, and the work
area becomes your entire document.
FIGURE 25.32
The color of the layer duration bar indicates where content is available and visible.
When you place a video file in the timeline, the entire file is always available to you no matter how
many times you trim or split it. Trimming a file changes the visibility of that file, but just like a
hidden layer, the visibility can always be restored. You can do this by simply dragging the ends of
the dark green areas of the layer duration bar into the light green areas to restore visibility. You
also can place the current time indicator anywhere in the light green area and choose Trim Layer
Start/End to Current Time, which moves the dark green area back to the current time indicator. Of
course, you are working blind if you use this method, because the light green area isn’t visible.
If your layer duration bar is light gray, this indicates that the area has no content at all. As you add
more files to your video project, you’ll see this more often as some of your files have a longer dura-
tion than others.
Moving Video Layers
Moving video layers is a fairly straightforward process. You’ll probably find yourself dragging lay-
ers around fairly frequently without even thinking about it as you work on your video project. You
can move layers around in more than one way, so I briefly cover each one so you are aware of

them.
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Changing the layer hierarchy
Changing the layer hierarchy in a video project is done exactly the same as any other project. As
you work in the timeline, don’t forget that the Layers panel is very much a part of your work area
as well. You can select, delete, and move layers in the Layers panel. To move a layer up or down in
the hierarchy, click it inside the Layers panel and drag it into position.
Dragging layers inside the layer duration bar
To change the relative position of a video in your timeline, you can simply click and drag its layer
duration bar back and forth inside the timeline. Photoshop doesn’t have a distinguishing icon for
this action, but if your layer is visible, you can preview the movement in the document window. It
looks like changing the position of the current time indicator manually, but of course the layer is
moving rather than the indicator. As mentioned earlier, you can drag a layer right past the begin-
ning or end of the document, effectively trimming the ends of the layer. This content is always
available even then, because you can always drag it back into the document.
Changing the position of the layer in
and layer end points
The most precise way to move a layer is to use the panel menu to change the layer in or layer end
point to the position of the current time indicator. Simply move the current time indicator to the
position where you want the layer to begin or end, and select Move Layer In (End) Point to
Current Time from the panel menu. This slides the indicated end of the layer to the current time
indicator. If the layer has been previously trimmed, the Layer In/End point is defined as the visible
end of the layer. Figure 25.33 indicates this type of layer movement.
FIGURE 25.33
After moving the layer in point to the current time indicator, the trimmed section (light green) is still before
the current time indicator and the “in point” is defined as the beginning of the visible section of the video
layer.
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Splitting Video Layers
To split a video layer, move the current time indicator to the location where you want the video
split and choose Split Layers from the Animation panel menu. When a video layer is split, it is
divided into two different layers, with the beginning of the split video segment on one layer and
the end on another, as shown in Figure 25.34. If you watch a video right after you have split it,
you won’t see any difference in the video playback.
FIGURE 25.34
Splitting a layer creates two layers from one.
You can see from looking at the layer duration bars that the full content of the video file is on both
layers. This means that you can drag either layer to duplicate the content of the other. In fact, this
is a viable reason to split the layer in the first place. By dragging out the end of one of these layers
and repositioning it, you can create a stutter effect in the video. That’s great for kissing shots.
Another reason to split video layers is to insert something between the two clips—another video, a
still shot, or a title. Figure 25.35 shows a title placed after the first segment of the split video.
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FIGURE 25.35
Splitting a layer allows you to insert other layers between the two segments.
As you saw in Figure 25.31, stacking up split layers with other layers placed in there can make the
Animation panel look very busy. When you look at the Layers panel, you only have to understand
how the layer hierarchy works to know which layers are visible. When you look at the Animation
panel, you need to understand the hierarchy and the layer duration bar.
In Figure 25.36, the layers are clearly marked so you can see which layers are visible and when.
Follow the layer hierarchy down to the first visible layer. That layer is visible until another layer,
higher up in the hierarchy, takes its place. After the top layer ends, the bottom layer in the hierar-
chy is the only one visible, so it is played until it is superseded by the second layer, higher up in
the hierarchy. The concept is simple, but as you add more layers, it can look very intimidating.

Even if you understand exactly how it works, it takes practice and experience to understand what’s
happening with the layers at a glance.
Tip
You can set layer favorites to show only the layers that you are working with at any given time. Choose Set
Layer Favorites from the Animation (Timeline) panel menu.
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FIGURE 25.36
First, look at the layer hierarchy, and then look for the first active layer.
Lifting and Extracting Unwanted
Sections of Video
You can clip your video and remove unwanted sections in just one step by lifting or extracting
them. You can lift or extract any portion of a video layer: beginning, middle, or end. Lifting a video
creates a gap in the area that the video once occupied, and extracting the video takes the video out
and closes the gap, so the video layer plays continuously.
Lifting a section of a video layer
Lifting a section of a video layer takes the work area out of the video, leaving a gap in the video the
size of the video that has been removed.
To lift a section of your video, set the work area around the section that you want to lift. Choose
Lift Work Area from the Animation (Timeline) panel menu. The video layer is turned into two
video layers, and a gap is created inside the work area. You can see in Figure 25.37 that the work
area is empty. Now I can place another file to fill the gap.
Extracting a section of a video layer
Extracting a section of video is a little different. Rather than deleting the video and leaving a gap,
extracting it deletes the video and closes the gap. This is the easiest way to simply delete unwanted
video from the middle of your video file.
You can extract a section of a video layer by setting the work area around the section you want to
delete. Choose Extract Work Area from the Animation panel menu. The video layer is turned into

two video layers, and the second portion of the video is moved into the work area to close the gap
created by the extraction. Figure 25.38 shows that the extracted video has been replaced by the
remaining video. This allows uninterrupted playback of your video file without having to fill the
gap created by lifting a video file.
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FIGURE 25.37
Lifting the work area deletes the video layer inside the work area, but leaves a gap where the video
used to be.
Performing Slip Edits
Performing a slip edit is simply a matter of dragging video footage through a trim, gap, or extrac-
tion in that video footage. For example, I have created a gap in my footage by lifting the work area.
Now I want to add another video file to fill the gap. I add the file and trim the ends to fill the gap
perfectly, as shown in Figure 25.39.
After I trimmed the new video clip, I realized that I wanted a slightly different section of video.
Without the capability of a slip edit, changing this clip would be a multistep process: I would have
to drag the ends of my video to the portion of the clip I wanted and then drag that section back
into place to fill the gap. A slip edit can do all this in just one easy step.
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