Corel Painter 2015 User's Guide download pdf (Page 865)

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Working with animation and digital videos | 837

Exporting movies as AVI

The AVI format supports several compression schemes. The following descriptions should help you choose

one; however, you’ll probably want to experiment with different compressors and settings to identify the

best settings for your work. You may also have different compression methods available.

• The Cinepak method produces acceptable motion and image quality at remarkably small file sizes. It

is the preferred format for CD delivery and transfer across the Internet. Cinepak takes a long time to

compress, and it can be difficult to find the best compression settings for certain image types and frame

rates.

• The Microsoft Video 1 method is designed for recording and playing back digitized video at high rates.

• 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.

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Comments to this Manuals

Chriscof 29 Apr 2024 | 04:09:55

Hello, im noob :)

Corel Painter 2015 User's Guide Page 865

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