Information Technology Reference
In-Depth Information
that in simpler terms, if you held the printed page up next to a picture viewed
at its actual size once the setting has been activated, the two will be identical.
You might wonder why such a setting is necessary, but on-screen images
usually appear smaller than they look when printed, even when viewed at
the 100 percent zoom setting.
To make the change, start Preview (it's in the Applications list of Finder), and
click the application menu and then Preferences. Then click the Images tab
and click the radio button next to Size on Screen Equals Size on Printout.
Tip 339
Convert Audio and Video Files
OS X makes it easy to switch audio or video files to different formats within
Finder.
Transcoding Audio
If you have an AIFF or WAV audio file that you'd like to convert to iTunes'
native MP4 audio format, which usually has the
.M4A
file extension, just right-
click it and select Encode Selected Audio Files (you might have to click Services
→Encode Selected Audio files). Then select the format you'd like from the
Encoder drop-down list. Arguably, the High-Quality option in the list is fine
for most needs—this will match the quality of the majority of MP3 files cur-
rently available, although if you hover the mouse over each option in the list,
you'll see a tooltip explaining what the technical settings are. Once you're
done, click the Continue button to start the encoding. The new file will be
outputted alongside the old one.
Downsampling Video
Want to shrink a 1080p or 720p movie to a smaller frame size? Right-click
it, and select Encode Selected Video files (you might have to click Services→
Encode Selected Video Files). Then choose the settings you want from the
dialog box that appears and click the Continue button to convert the file. Note
that it's not possible to upsample a file; that is, you can't convert a 480p
movie to 720p, for example. You can only downsample movies—converting a
1080p movie to 480p, for example.
