Animations with fluid subject movement are created when the individual frames are "played" at approximately 24 frames per second. Examples of animations are all TV programs or movies. From a technical point of view, output on a computer monitor also represents animations.
Animations are not always produced purely for entertainment purposes. Animations are also used in sales to promote sales and in connection with imaging procedures in a medical context.
Further references:
https://de.wikipedia.org/wiki/Animation
http://www.kreativ-workshops.net/demo-gimp2-8-F/html/9-1.html
The following video shows 12 basic principles that you should pay attention to with animations.
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