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Review questions

Q1: Describe a simple way to create animation.
A1: A simple way to create animation is to start with a layered Photoshop file. Use the New Frame button in the Animation palette to create a new frame, and use the Layers palette to alter the position, opacity, or effects of one of the selected frames. Then create intermediate frames between the selection and the new frame either manually using the New Frame button or automatically using the Tween command.
Q2: In what instances can you tween animation frames? When can't you tween frames?
A2: You can instruct Adobe ImageReady to tween intermediate frames between any two frames, to change layer opacity or position between two frames, or to add new layers to a sequence of frames. You cannot tween discontiguous frames.
Q3: How do you optimize an animation?
A3: Click the Show Options button in the Optimize palette, and then choose File > Save Optimized to optimize animations. Choose Optimize Animation from the Animation palette menu to perform optimization tasks specific to animation files, including removing redundant pixels and cropping frames according to the bounding box.
Q4: What does optimizing an animation accomplish?
A4: In addition to the optimization tasks applied to standard GIF files, ImageReady generates an adaptive, perceptual, or selective palette for the file based on all frames in the animation if you selected one of those palettes. ImageReady applies a special dithering technique to ensure that dither patterns are consistent across all frames, to prevent flickering during playback. The application also optimizes frames so that only areas that change from frame to frame are included, greatly reducing the file size of the animated GIF.
Q5: What is frame disposal? Which frame disposal method should you generally use?
A5: A frame disposal method specifies whether to discard the selected frame before displaying the next frame when an animation includes background transparency. This option determines whether the selected frame will appear through the transparent areas of the next frame. Generally, the Automatic option is suitable for most animations. This option selects a disposal method based on the presence or absence of transparency in the next frame, and discards the selected frame if the next frame contains layer transparency.
Q6: How do you edit an existing animation frame?
A6: To edit an existing animation frame, you first select the frame, either by clicking the frame thumbnail in the Animation palette or by navigating to the desired frame using the First Frame, Backward, or Forward buttons in the Animation palette or Layers palette. Then edit the layers in the image to update the contents of the selected frame.
Q7: What file formats can you use for animations?
A7: Files for animations must be saved in GIF format or as a QuickTime movie. You cannot create animations as JPEG or PNG files.



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