Apple Aperture - Manual (Page 69)

Chapter 2 The Aperture Interface 69
I
M Web Copyright field Enter copyright text for web galleries and web journals here.
N Previews options To set Aperture to create previews for the images in all new
projects and new Libraries, select the “New projects automatically
generate previews” checkbox. Deselect this option if you don’t
want previews created for images in new projects.
To enable sharing of JPEG preview images with other applications,
select the “Share previews with other applications” checkbox.
To change the image quality of the previews, drag the Preview
Quality slider. The higher the quality you select, the more disk
space the preview requires.
To set a maximum pixel size for your previews, choose a size from
the “Limit preview size” pop-up menu.