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Grokking The Gimp
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9.1.6 IWarp

The IWarp filter, found in the Image:Filters/Distorts menu, can interactively warp parts of an image and then automatically generate an animation that morphs from the original image to the warped one. This can be useful for creating certain types of animations.

Figure  9.11(a)

  
Figure 9.11: The IWarp Filter
Figure 9.11

illustrates an image of Canadian geese, and Figure  9.11(b) shows the dialog for the IWarp filter. The dialog opens in the Settings tab, which offers a number of options. The Deform Radius and Deform Amount sliders control the size and intensity of the warping effect, and the type of warping is selected using one of the Move, Remove, Grow, Shrink, Swirl CCW, or Swirl CW radio buttons. The warping is applied by clicking and dragging in the thumbnail of the image. The selected warping mode is applied in the region around the mouse cursor; the size of the region of application is specified by the Radius slider. In this example, the Move warping function is applied, and the mouse is clicked in the middle of the head of the central goose. Dragging the mouse vertically upwards creates the distortion shown in the dialog's thumbnail in Figure  9.11(b).

To automatically convert the distortion into an animation, click on the Animate tab in the dialog. The dialog corresponding to this tab is shown in Figure  9.12.

  
Figure 9.12: Using the IWarp Automated Animation Feature
Figure 9.12

The animation is created by clicking the Animate checkbox and then using the slider to choose the number of frames to use. This creates a sequence that morphs from the original image to the distorted one. If the Reverse radio button is clicked, the animation goes from the distorted image to the original. If the Ping Pong radio button is chosen, the animation starts with the original image, animates to the distorted, and then returns to the original. This last option generates twice the number of frames selected by the Number of Frames slider. Choosing the Ping Pong animation option for the example with the Canadian goose produces an animation where the goose stretches its neck up, perhaps to get a better look around, before returning to its original state. The result is shown here:

Animation

(Note: The animation can be turned off by clicking on the Stop button of your browser.)




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