| You can display a full-screen slideshow of the images in any Aperture objectproject, album, Web gallery, Web journal, and so onby using the Slideshow command. Choose File > Slideshow or press Shift-S to begin. Tip Sometimes Aperture doesn't update the File menu properly. If you find that Slideshow is dimmed in the File menu, you can probably still access it by pressing Shift-S.
Aperture will present a small dialog box asking you which slideshow preset you want to use. Select one and click Start. Your screen should fade to black, and then your slides will begin. You can pause the slideshow by pressing the spacebar. A second press of the spacebar will restart the show. Configuring Slideshow Presets You can use the Slideshow Presets dialog box to customize your slideshow display and add music and effects. To open the dialog box, choose Aperture > Presets > Slideshow. As with all of Aperture's presets editors, you click the + button below the Presets list (Figure 8.15) to create a new slideshow preset. Figure 8.15. By creating slideshow presets, you can create custom slideshow specifications. 
For each preset, you can configure the following parameters: Timing: From the Timing menu, you can choose to display each image for a fixed amount of time, advance slides manually, or fit your slide display to a piece of music. If you choose Fit to Music, Aperture automatically calculates how long each slide should be displayed to fit all of the slides within the duration of the chosen song. Duration: If you select a fixed timing, you can use the Duration slider to select the display time. Loop Slideshow: If you want the slideshow to loop, check this box. After the slide-show starts, you can stop it by pressing Esc. Quality: Your slideshow can display Aperture's cached proxy images, which load very quickly, or full-size images. If you're using a small monitor, the proxy images may deliver all of the quality you need. If you're using a larger monitor, however, you should opt for full-size images. With full-size, full-res display, you won't be able to advance through your slides as quickly, since Aperture will need some time to cache each image before it appears. Note If you're using manual advancement and full-res image quality, Aperture will display a proxy image if you choose to advance before the next slide as been cached. As soon as the full-res image is loaded, the proxy will be replaced.
Play Slideshow on Main Display Only: If you're running a dual-monitor system and you want the slideshow to run only on your primary display, select Play Slideshow on Main Display Only. Rows and Columns: Aperture can display multiple images in a grid on your screen and then swap out each image as the show advances. (Check out the included 4-Up presets to see how a slideshow set up this way looks.) The Rows and Columns sliders let you choose the number of images that you want on the screen at one time. Padding: You can adjust the space between the different images by dragging the Padding slider. Fade Time: Aperture automatically adds dissolves between slideshow images. You can adjust the duration of the dissolve using the Fade Time slider. Setting Fade Time to 0 eliminates the dissolve. Crossfade: Select Crossfade to cause one image to dissolve over another. If the box is unchecked, Aperture will fade out the A image to the background color and then fade in the B image. Background: You can select the background color that is displayed behind your images. Play Music During Slideshow: Select Play Music During Slideshow to view the contents of your iTunes library. From here, you can select a playlist or song to play during the show.
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