Tài iệu Photoshop cs5 by Dayley part 110 doc

It has features such as a current time indicator that allows you to move through time in your file and lists the layers that are placed in your file.. Here’s what these features do and h

After you click OK to create the new document, you are reminded that Adobe has just turned on the Pixel Aspect Ratio Correction for this document because it presumably will be part of a ren-dered video file eventually

The document created by the Film & Video presets looks different than the usual Photoshop docu-ment Notice in Figure 25.8 that guidelines are added to the blank canvas These guides don’t print

or show up on your video; they indicate the safe zones in the video file As long as your action is contained within the outside bounding box and your text is contained within the inside bounding box, you won’t lose any of the important pieces of your video to a television that cuts out the edges

of the video and enlarges the center

FIGURE 25.8

The Film & Video presets give you guides for placing and editing your video

Title safe area Action safe area

Note

If you are creating a video for the Web, you probably chose the square pixel settings, which means the Pixel

Aspect Ratio Correction doesn’t have to be turned on You can disregard the guides as well, because computer

monitors play the entire video without cropping the edges n

You can now place an image in this document or create a neutral background that can be placed in the video file as a separate layer behind any photos that are placed in the video file

Video filters

The Video filters are accessed in the filter menu and are specifically for video files Video filters can

be used on video or image files that will be placed into video files These filters work to reduce the noise of a video file

Interlaced video is created by generating every other line of video in one pass and then filling in the missing lines in the second pass De-interlacing can clear the look of moving video by removing either the odd or even lines and filling those lines in by either duplicating or interpolating the existing lines

The difference can be dramatic, especially on a computer monitor that has a high enough quality output

to catch the variable scans Figure 25.9 shows the same frame before and after de-interlacing

FIGURE 25.9

The first image is fuzzy; you can see the image echo The second image has been de-interlaced and is

much clearer

Choose Filter ➪ Video ➪ De-Interlace to open the De-Interlace dialog box shown in Figure 25.10

You can select whether to use the odd or even lines of the video file and whether to use duplication

or interpolation for filling in the gaps

NTSC Colors

When you apply the NTSC Colors filter to an image or video file, you are restricting the colors used in that file to the colors used in television production This keeps your video cleaner by

FIGURE 25.10

The De-Interlace dialog box

Features of the Animation (Timeline) Panel

The Animation (Timeline) panel consists of a timeline for creating animations or editing video through time It has features such as a current time indicator that allows you to move through time

in your file and lists the layers that are placed in your file You can access layer properties that allow you to animate any layer in your file in different ways, depending on the layer type selected

The Animation (Timeline) panel has so many features that I break them into three categories for you: time adjustment, work area, and icons

Time adjustment

The Animation (Timeline) panel includes many time indicators and time features, as shown in Figure 25.11 Here’s what these features do and how to use them:

FIGURE 25.11

The Time features of the Animation (Timeline) panel

Current time Current time indicator Time ruler

Current frame rate

Zoom slider Playback controls

l Current time: The current Time is a numerical representation of where the current time

indicator is placed on the time ruler Notice that the current time indicated in Figure 25.11 matches exactly with the position of the current time indicator

l Current frame rate: This number is an indicator of how many frames are in every second

of an animation or video The default setting, which is the NTSC standard rate shown in Figure 25.11, is 29.97 frames per second

l Time ruler: The time ruler indicates the time relative to the video layers.

l Current time indicator: The current time indicator is a slider that allows you to preview

your animation or select a particular time or frame in your animation by dragging it back and forth across the video layers

l Playback controls: The playback controls allow you to rewind, play, pause, and

fast-forward your animation or video as well as move the current time indicator to the begin-ning of the animation

Tip

You can press the spacebar to play and pause your animation n

l Zoom slider: The zoom slider is a handy feature that allows you to expand or reduce the

time ruler Zooming in increases the length of each second in the Timeline If you zoom all the way up, each frame takes up the same amount of room as each second did at the lowest setting

l Current frame: The current frame can be viewed in lieu of the current time if you choose

Panel Options from the Panel menu and select Frame Number You can see in Figure 25.12 how the look of the Timeline panel has changed

l Frame ruler: When the Animation (Timeline) panel is set to the frame number display,

the time ruler becomes a frame ruler, indicating the number of frames relative to the video layers, as opposed to the number of seconds

FIGURE 25.12

You can change the panel options to show the current frame number in the Animation (Timeline) panel

Work area

The work area of the Animation (Timeline) panel includes the following features that can be seen

in Figure 25.13

FIGURE 25.13

The work area features of the Animation (Timeline) panel

Comments track

Time vary stopwatch

Layer duration bar Coached frames indicator

Global lighting track

l Comments track: The comments track provides a space to enter comments in any area of

the timeline

l Global Lighting track: The Global Lighting track allows you to animate Global Lighting

throughout all layers at the same time

l Time-Vary Stopwatch: The Time-Vary Stopwatch can be turned on in any layer property

that can be animated It allows keyframe indicators to be placed inside the property layer

l Video layers: These represent the layers in your video file They correspond exactly to

the layers in the Layers panel Notice in Figure 25.13 that the top layer is actually an Adjustment layer

l Work area indicators: By dragging these indicators to different spots in your timeline,

you can reduce your work area to the immediate area you are working on When you start

a playback, it is restricted to this area You also can render and export just the segment of your video or animation contained inside the work area indicators This tool is more use-ful as your file becomes longer in duration

l Cached frames indicator: The cached frames indicator shows the frames that have been

cached in the computer’s memory and can be easily previewed When the line is solid, all the frames in that area have been cached If the line looks jagged, only a few frames have

been cached in that area If the line is nonexistent, none of the frames have been cached yet As you play back video, you’ll notice that a limited number of frames can be cached

As a consequence, past frames are discarded as new frames become cached

l Layer duration bar: This bar indicates the duration of the layer inside the timeline When

the bar is light green, the layer is not viewable Drag either end of the bar to lengthen or shorten it You can edit the layer position and length in the Timeline in several ways that are covered when I discuss the Animation (Timeline) panel menu

Icons

The icons around the Animation (Timeline) panel make certain actions quick to perform Some perform their function with a quick click, and others require more input The icons are labeled in Figure 25.14

FIGURE 25.14

The icons on the Animation (Timeline) panel

Animation (timeline) panel menu

Toggle onion skins

Delete

Convert to frame-based animation

l Toggle onion skins: This icon allows you to quickly enable or disable your view of onion

skins in the frame being previewed

l Delete Keyframes: You don’t need an explanation here Click this icon whenever you

have a keyframe highlighted that you want to discard

l Convert to Frame Animation: Clicking this icon changes the Timeline panel to the

Frame Animation panel Your file also is converted to a frame-based animation This option is viable only if you are working on an animation rather than a video file, because video files do not play in the Animation (Frames) panel

l Animation panel menu: Clicking this icon brings up the Animation panel flyout menu

This is a pretty hefty menu, so I give it its own section

Defining the options found in the Animation (Timeline) panel menu

The Animation (Timeline) panel menu has many features, as shown in Figure 25.15 Some of them are pretty intuitive, and some are covered in much greater depth in this and following chapters I give you a quick rundown of the list so you’ll have a comprehensive at-a-glance resource Where any of these options are covered in more depth in a different chapter, you find a cross-reference to that chapter after each definition

FIGURE 25.15

The Animation (Timeline) panel menu

l Delete, Copy, and Paste Keyframe(s): Use these options to Delete, Copy, or Paste a

key-frame Duplicating a keyframe duplicates the frame, the keyframe indicator, and if you’ve selected more than one keyframe, all the interpolation in between You may want to note

that you can’t use the hotkeys for these functions (Ctrl/Ô+X, Ctrl/Ô +C, and Ctrl/Ô+V).

l Keyframe Interpolation: This option allows you to set the type of interpolation you want

between keyframes Your choices are Interpolation, which generates tweening between keyframes, and Hold, which holds the keyframe settings until the next keyframe See Chapter 27

l Select All and Select No Keyframes: This selects or deselects all the keyframes in the

tar-geted layer

l Set Start or End of Work Area: Click these options to move the start or end of your

work area to the position of the current time indicator, as shown in Figure 25.16

FIGURE 25.16

Changing the work area highlights a section of my animation or video so playback is restricted to that area

l Go to: This option allows you to move your current time indicator to any of the following

places: a specified time, the next frame, the previous frame, the first frame, the last frame, the beginning of the work area, or the end of the work area

l Allow Frame Skipping: Check this option to skip frames as you preview an animation or

video This allows Photoshop to play the preview in real time, although the quality is not

as good as the rendered version

l Move Layer In Point to Current Time: This option repositions the selected layer’s start

point to the position of the current time indicator

l Move Layer End Point to Current Time: This option repositions the selected layer’s end

point to the position of the current time indicator

l Trim Layer Start to Current Time: This option splits the selected layer at the position of

the current time indicator and discards the first portion of the layer

l Trim Layer End to Current Time: This option splits the selected layer at the position

of the current time indicator and discards the last portion of the layer, as shown in Figure 25.17

FIGURE 25.17

The dark green segments of the layer indicate the layer duration The light green areas indicate that, although the video is still playing, that particular layer doesn’t exist in the timeline

l Trim Document Duration to Work Area: This deletes any video layers or portions of

layers that fall outside the work area

l Split Layer: This splits the layer into two at the site of the current time Indicator After a

layer has been split, you can edit each portion individually

l Lift Work Area: If you lift the work area, all the layers in the work area are deleted, but a

space the size of the work area is left in the timeline

l Extract Work Area: Extracting the work area deleted all the layers contained in the work

area, closing the gap in the timeline left by the deletion

l Make Frames From Layers: This option allows you to take an image with several layers

and create an individual frame from each layer See Chapter 29 for more information

l Flatten Frames Into Layers: This creates a layer for every frame in your video or

anima-tion See Chapter 29

l Edit Timeline Comment: This allows you to create or edit a timeline comment in the

Comments track

l Export Timeline Comment: This allows you to export your timeline comments into a

separate text file

l Document Settings: The Document settings in the timeline include the duration of the

animation and the frame rate

l Convert to Frame Animation: Rather than clicking the Frame icon in the panel, you can

go the long way and choose this option from the panel menu

l Onion Skin Settings: Clicking this menu item brings up the Onion Skin Options dialog

box, where you can set several options, including what frames become onion skins and their opacity See Chapter 29

l Enable Onion Skins: When this option is checked, you can use the Onion Skin icon at

the bottom of the timeline panel to toggle the view of the onion skins on and off See Chapter 29

l Show: From this option, you can choose whether to show all layers or your favorite

lay-ers You also can set up or edit your favorite laylay-ers

l Enable Timeline Shortcut Keys: This makes shortcut keys available to use for the

Animation (Timeline) panel

l Panel Options: This option allows you to change the thumbnail size of the layers You

also can change the ruler on the timeline from Timecode to Frame number

Accessing the Video Layers menu

You should be especially aware of one other menu while working in the Animation (Timeline) panel This menu can be found by choosing Layer ➪ Video Layers from the File menu As I start to show you more of the advanced techniques of animation and video, this menu is used more fre-quently You can see this menu in Figure 25.18

FIGURE 25.18

The Video Layers menu

l New Video Layer From File: Like the Place command, this option allows you to import

a separate file as a layer in your existing file

l New Blank Video Layer: A new blank video layer is handy for making changes to

exist-ing video, and it’s imperative if you are animatexist-ing an image or rasterized layer that doesn’t already contain a video layer Besides the regular layer properties, a video layer contains

an Altered Video layer that allows you to make changes frame by frame The new video

FIGURE 25.19

A video layer contains an Altered Video property that allows you to draw in it frame by frame

l Insert Blank Frame: This creates a blank frame on the Altered Video layer at the position

of the current time indicator

l Duplicate Frame: This duplicates the current frame on the Altered Video layer and places

it directly after the selected frame

l Delete Frame: This deletes the current frame on the Altered Video layer.

l Replace Footage: Use this option if the file containing the original footage has moved

locations and Photoshop can’t locate it Click Replace Footage, and browse to the new location to correct the link between the original file and the Photoshop document you’ve created with it

l Interpret Footage: If you have video layers that contain an alpha channel, this option

allows you to determine how the alpha channel is interpreted You also can change other options such as whether the video is interlaced This is one other place where you can modify the frame rate as well

l Hide Altered Video: You could just click the eye on the video layer you want to hide, but

if you really like to take the scenic route, the Hide Altered Video layer option accom-plishes the same thing

l Restore Frame and Restore All Frames: By selecting one of these options, you can

dis-card the edits you’ve made to any or all frames All edits to video in Photoshop are non-destructive, meaning that they do not affect the original file

l Reload Frame: If the original footage of a video file you are using has been changed,

Photoshop eventually reflects those changes You can use this option to reload the footage for the current frame you are working on, or you can simply use the playback controls to play the footage, allowing Photoshop to reload the original file

l Rasterize: A video layer is dynamic and can be modified frame by frame When it is

ras-terized, it becomes a flat image, containing only the data in the frame that was selected when it was rasterized That data plays continuously through the duration of the original video layer