01-02-2013, 12:02 PM
Animation & Multimedia
1Animation.ppt (Size: 4.68 MB / Downloads: 67)
What is Animation?
50 years ago Walt Disney created animated objects such as Mickey Mouse.
Today the process used to create animated objects has had to change.
In fact, it continues to change.
Animation
The word “animation” is a form of “animate,” which means to bring to life.
Thus when a multimedia developer wants to bring an image to life, animation is used.
For example, a spinning globe is it better to film the motion on video, or is animation a better solution.
The Power of Motion
Visual effects such as wipes, fades, zooms, and dissolves are available in most authoring packages.
But animation is more than wipes, fades, zooms, and dissolves.
Until Quick Time and AVI motion video became more common place animations were the primary source of dynamic action in multimedia.
Principles of Animation
Animation is possible because of a a biological phenomenon known as persistence of vision
And
The psychological phenomenon called phi .
An object seen by the human eye remains chemically mapped on the eye’s retina for a brief time after viewing.
Combined with the human mind’s need to conceptually complete a perceived action.
This makes it possible for a series of images that are changed very slightly and very rapidly, one after the other, seem like continuous motion .
Animation and Frame Rates
TV video builds 30 entire frames or pictures every second.
Movies are shot at a shutter rate of 24 frames per second, but using projections tricks the flicker is increased to 48.
On some projectors each frame is shown 3 times before the next frame, for a total of 72 flickers per second which helps eliminate the flicker effect.
Cel Animation – plays at 24 frames per second.
Path Animation
Moves an object along a predetermined path on the screen
The path can be a straight line or have a number of curves.
Starts with keyframes (the first and last frame of an action).
The series of frames in between the keyframes are drawn in a process called tweening.
Tweening requires calculating the number of frames between keyframes and the path the action takes, and then actually takes, and then sketches a series of progressively different outlines.