I spent a couple of days experimenting with animation and created this little GIF to show the different timing charts.
1 Second = 24 frames
1 Frame = 0.04166... seconds
1 Keyframe every 6 frames
4 Timing charts = 1 second
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I prepared a second example to notice that although the timing charts have different effects, the time that the animation takes place is exactly the same.
Poke-Principles of Animation 01: Timing
Timing is about controlling how long each drawing of an animation is held on the screen. More drawings does not always equal better animation! Oftentimes putting an animation on 3s (8fps) can give a motion a heavy and deliberate feel.
This is why professional animators often believe that artificial AI in-betweened animation takes away deliberate choices made by the artist creating the scene. The heart and soul of 2d animation is that it is a medium where every fraction of every second of what ends up on screen is a conscious decision made by a team of artists.
The Joker? Lex Luthor? Green Goblin? Voldemort? Palpatine etc none of these villans is more fanatic, crazy, sociopath and psychopath than Eobard Thawne aka Reverse Flash.