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Chapter 8. Frame-by-Frame Animations > Understanding Frame Rate

Understanding Frame Rate

The illusion of animation relies on the human brain’s ability to fill in gaps in continuity. When we see a series of images in very quick succession, our brain perceives a continuous moving image. In animation, you must display the sequence of images fast enough to convince the brain that it’s looking at a single image.

Frame rate controls how fast Flash delivers the images. If the images come too fast, the movie turns into a blur. Slow delivery too much, and your viewers start perceiving each frame as a separate image; then the movement seems jerky. In addition, when you’re working in Flash, you’re most likely planning to deliver the movie over the Web, and you may not be able to get the precise control you’d like to have to deliver a fast frame rate. The standard rate for film is 24 frames per second (fps). For animation that’s going out over the Web, 12 fps is a good setting.


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