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Working with animation and digital videos 807

•The Full Frames (Uncompressed) method uses no compression, so the images

retain all of their quality. With a large frame size, some computers might not be

fast enough to play at a high frame rate. This is the preferred format for

transferring Corel Painter movies to AVI-editing applications.

The compression ratio is inversely proportional to image quality. In the

Video Compression dialog box, the Compression Quality slider allows you to set an

optimum level between the amount of compression and image quality.

Key frames are used in temporal compression methods. Each key frame is stored in its

entirety. The next set of frames, up to the next key, are saved only as changes. With

some compression methods, you can specify the frequency of key frames with the Key

Frame Every [Number] Frames option.

With some compression methods, you can also limit the speed of data transmission with

the Data Rate option. The data rate limit overrides the Quality slider setting, if

necessary, to keep the compressed movie within the set limit.

Understanding frame rate

Frame rate describes the number of image frames displayed per second (fps). The frame

rate can determine not only how big a file your animation is, but also how smooth the

motion appears.

When you save a movie as an AVI file, you can specify the rate of display. This doesn’t

necessarily mean that what you specify is what you’ll experience. Factors like frame size,

compression method, and computer speed can prevent some movies from achieving

their set rate. If your animations will be viewed on the computer only, frame rates of 8,

10, and 12 fps are good choices. If your animations will be viewed elsewhere, you should

consider the following frame rates:

• The frame rate of film is 24 fps.

• The frame rate of National Television System Committee (NTSC) video is 30 fps

(29.97 fps in broadcast video). NTSC is the video standard used in the United

States.

• The frame rate of Phase Alternating Line (PAL) video is 25 fps.

These frame rates are sufficient to produce smooth, continuous motion with filmed or

video-recorded subjects.

Animation drawings contain far less detail than live-action images. The difference in the

level of detail allows animations to be produced at frame rates significantly lower than

those designed for live action. Because of the smoothness of color fills and continuity

between images, animations can look quite nice at rates between 10 and 15 fps.

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