Apple Aperture Late-Breaking News - Manual (Page 22)

22
Comparing the File Sizes of JPEG Previews and Their Master Files
Previews use less disk space than their associated master files, especially for high-resolution
RAW files. The charts below show the disk space that previews take for fifty 16-megapixel
1Ds Mark II images. The previews were created at three compression quality settings
(10, 8, and 6) and at three size settings (No limit, 2560, and 1680). In the first chart, you can
see how the compression setting affects the disk space used for each preview size. In the
second chart, you can see how the preview’s size affects disk space used for each
compression setting.
No limit 1680 2560
200
180
160
140
120
100
80
60
40
20
0
P
review disk s
pace (MB)
Preview image size
(long dimension in pixels)
Preview file size by compression setting
1Ds Mark II images (50 images, 678.1 MB)
8
6
Compression setting
10
10 6 8
200
180
160
140
120
100
80
60
40
20
0
P
review disk s
pace (MB)
Compression setting
No limit
2560
1680
Preview file size by image dimension
1Ds Mark II images (50 images, 678.1 MB)
Long dimension
in pixels