Ceci est une ancienne révision du document !
When building a presentation, it is important to present the information in a pleasing and informative way. Using slide transitions provides a visual move from one topic to the next, and using animations helps to inform viewers or provide emphasis on the current point. Overuse of transitions and animations can cause your presentation to look less than professional. However, the appropriate use of these features will give your presentation a polished and professional appearance.
Slide Transitions
Transitions are the visual changes made when moving from one slide to the next. Transitions provide a visual clue to the audience that you are moving to a new topic. In general, you will use the same transition for all the slides, but, in some cases, you will want to use a different transition to show the viewers a change of topic.
With the slide you want to change displayed in the main view, select Slide Transition from the Tasks pane. The selection list provides you with a collection of different slide transitions. If you have Automatic preview checked at the bottom of the Slide Transition pane, you will see a preview of the transition when you select it or change its settings.
You can further modify the transition in the Modify transition section of the pane. Speed will change the rate at which the slide is displayed. Sound lets you play a sound with the transition. You can select a sound from the defaults provided, or select your own. Once you select a sound, you can select Loop until next sound. You will rarely have a use for this, but it is there should you need it.
In the Advance slide section, you set how and when you want the slide to advance. On click means the slide will display until you click the mouse or press the space-bar. Automatic after allows you to automatically advance the slide after a set number of seconds. When selected, you can adjust the number of seconds in the spinner box.
At the bottom of the pane, you have three buttons. Apply to All Slides does what it says; it applies the transition to all the slides in the presentation. Play causes the transition to run in the main view. Slide Show starts the presentation beginning with the current slide.
Animations
Animations are similar to transitions, but instead of acting on the slide, it acts on individual objects in the slide. Animations help create emphasis, flow, and visual interest as you present the objects on a slide. They keep the audience aware of the current subject, and act as a visual clue to the presenter.
To create animations, first select the slide which you want to create animations for. Select the object(s) you want to animate, and open the Custom Animations pane in the Tasks pane. Click on Add, which opens the animations dialog. Here you can select the animation you want for the object(s) selected.
Impress provides four different animation types: Entrance: These animations play as the object appears on the page. Emphasis: These animations are used to create emphasis such as changing colors, blinking, etc. Exit: These animations play as the object leaves the page. Motion Path: These animations cause the object to follow a defined path.
There is a fifth tab in the animations dialog related to media objects. They allow you to start, stop, and pause media objects.
Once you have selected your animation, click OK.
The Effect section of the animation pane give you the ability to fine-tune your animation. Start controls what event will trigger your animation. On Click will trigger the animation when the mouse button is clicked or you press the space-bar. With Previous triggers the animation when the animation before it plays. After Previous plays the animation after the previous animation. The second control relates directly to the type of animation you select. If it is a motion animation, it asks you for a direction. If the animation changes colors, it will asks you for a color. Finally, the Speed controls the speed at which the animation plays.
Animation Example
The real power of animations comes when you combine them to create interesting effects for your objects. In our example, the effect we will create will display items in a list one at a time. As the next items displays, the previous one will gray out. Finally, all the list items will fade out before the slide transition.
Create a new slide, and, in the text area, add four list items. Select all four list items, and click Add in the Custom Animation pane. On the Entrance tab, select Fly In and click OK. Select each of the animations in the animations pane and set the start to on click, direction to from bottom, and the speed to a speed that looks good on your machine.
For the color change effect, select the first three items in the text area of the slide, and click the Add button. On the Emphasis tab, select Change Font Color, and click OK. For each of these three new animations, change the start to with previous, the color to gray, and the speed to a speed that looks good on your machine. Move the color change animation for the first item up using the Change order arrows. Move it up under the entrance animation for the second item. Move the second change color animation up under the third entrance animation, and leave the third color change under the fourth entrance animation.
Finally, we will create the fade for all the items. Select all four list items in the slide's text area. Click on Add in the animation pane. On the Exit tab, select Dissolve and click OK. Set the first exit to start on click and the other three to after previous. Select a speed for the dissolve that works for your machine.
Test your animations by clicking on Slide Show in the animation pane. If you set everything correctly, each item should fly in from the bottom and gray out when you click the mouse. At the end, all four items should dissolve.
Transitions and animation are key to creating a professional looking presentation. If you are careful to not get carried away, you can create a polished and memorable presentation for your audience. Remember that the idea behind a presentation is to present your ideas to your audience, not to impress them with fancy, overdone transitions and animations.