Apple MB673Z/A User Manual - Page 196

Working with Preview Images, Displaying Images in the Viewer

Page 196 highlights

Working with Preview Images Aperture allows you to create and use JPEG previews of versions in the library. Aperture preview images improve the display of images in Aperture and allow you to easily use your images in other applications. These preview images are used to speed up the display of images in the Viewer, in the Browser, and in Full Screen view. Previews are JPEG images generated by Aperture that represent the original master with any applied adjustments. You can have Aperture create and maintain previews automatically as you add or modify versions, or you can create previews manually whenever you need them. To maintain an efficient use of disk space and adequate display speed, you can control the size of previews, from a preview image that has the full-size dimensions of the master down to a preview image that is 1280 pixels in the longest dimension. You can also control the JPEG compression quality of the previews. Furthermore, if your workflows do not benefit from previews, you can configure Aperture to not create them at all. Previews are also shared with applications in iLife and iWork. As an additional advantage of using previews, Aperture uses JPEG previews to display images in slideshows. The result is smoother, more responsive slideshows. However, if the previews are absent or not up to date, Aperture must render the preview images before the slideshow begins. Displaying Images in the Viewer When a version needs to be displayed in the Viewer, Aperture does the following: 1 Aperture draws the thumbnail image (a JPEG image that is 1024 pixels in the longest dimension). 2 Aperture draws the JPEG preview, if present. 3 Aperture decodes the master and applies any adjustments to it. Once the third step is completed, the adjustment controls become enabled. Because the JPEG preview is created with all the adjustments for that version, it appears onscreen faster than the adjusted master would. The result is a sharp preview image that appears quickly in the Viewer. 196 Part II Photo Editing

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196
Part II
Photo Editing
Working with Preview Images
Aperture allows you to create and use JPEG previews of versions in the library. Aperture
preview images improve the display of images in Aperture and allow you to easily use
your images in other applications. These preview images are used to speed up the display
of images in the Viewer, in the Browser, and in Full Screen view. Previews are JPEG images
generated by Aperture that represent the original master with any applied adjustments.
You can have Aperture create and maintain previews automatically as you add or
modify versions, or you can create previews manually whenever you need them. To
maintain an efficient use of disk space and adequate display speed, you can control the
size of previews, from a preview image that has the full-size dimensions of the master
down to a preview image that is 1280 pixels in the longest dimension. You can also
control the JPEG compression quality of the previews. Furthermore, if your workflows
do not benefit from previews, you can configure Aperture to not create them at all.
Previews are also shared with applications in iLife and iWork. As an additional
advantage of using previews, Aperture uses JPEG previews to display images in
slideshows. The result is smoother, more responsive slideshows. However, if the
previews are absent or not up to date, Aperture must render the preview images
before the slideshow begins.
Displaying Images in the Viewer
When a version needs to be displayed in the Viewer, Aperture does the following:
1
Aperture draws the thumbnail image (a JPEG image that is 1024 pixels in the
longest dimension).
2
Aperture draws the JPEG preview, if present.
3
Aperture decodes the master and applies any adjustments to it.
Once the third step is completed, the adjustment controls become enabled. Because
the JPEG preview is created with all the adjustments for that version, it appears
onscreen faster than the adjusted master would. The result is a sharp preview image
that appears quickly in the Viewer.