Set up the Viewer for onscreen proofing
Photos displayed on your computer screen may look different when displayed on computer screens that use different color technologies. Your photos may also reproduce differently in print depending on the type of printer, the paper used, and the color profile of the printing device.
To see what a photo will look like when you print it or view it on a different display, you can have Aperture adjust your display so that your photos resemble the final results. To adjust your computer display, you choose a proofing profile that matches, as closely as possible, the characteristics of the final output device. For example, if your photo will be printed on sheet-fed coated paper, you can choose a proofing profile for sheet-fed coated paper to see a close approximation of what the printed photo might look like. Aperture provides several dozen profiles that match the characteristics of many printers, display devices, and color spaces.
After choosing a proofing profile that matches the final output of the photo, you turn on the onscreen proofing feature, and the photo changes to show the expected results.
Onscreen proofing alters the look of photos in the Viewer and in full-screen view.
Choose a proofing profile
Choose View > Proofing Profile, and choose the profile you want from the submenu.
Turn onscreen proofing on or off
Choose View > Onscreen Proofing (or press Option-Shift-P).