Adobe Photoshop CS4 - Manual (Page 455)

448 USING PHOTOSHOP CS4
Saving and exporting images
Last updated 1/10/2010
Image Previews options (Mac OS) Saves thumbnail data for the file. Thumbnails appear in the Open dialog box.
File Extension options (Mac OS) Specifies the format for file extensions. Select Append to add the format’s extension
to a filename and Use Lower Case to make the extension lowercase.
Set file saving preferences
1 Do one of the following:
• (Windows) Choose Edit > Preferences > File Handling.
• (Mac OS) Choose Photoshop > Preferences > File Handling.
2 Set the following options:
Image Previews Choose an option for saving image previews: Never Save to save files without previews, Always Save
to save files with specified previews, or Ask When Saving to assign previews on a file-by-file basis. In Mac OS, you can
select one or more preview types. See “Mac OS image preview options,” below.
File Extension (Windows) Choose an option for the three-character file extensions that indicate a file’s format: Use
Upper Case to append file extensions using uppercase characters, or Use Lower Case to append file extensions using
lowercase characters.
Append File Extension (Mac OS) File extensions are necessary for files that you want to use on or transfer to a Windows
system. Choose an option for appending extensions to filenames: Never to save files without file extensions, Always to
append file extensions to filenames, or Ask When Saving to append file extensions on a file-by-file basis. Select Use
Lower Case to append file extensions using lowercase characters.
Mac OS image preview options
In Mac OS, you can select one or more of the following preview types (to speed the saving of files and minimize file
size, select only the previews you need).
Icon Uses the preview as a file icon on the desktop.
Full Size Saves a 72-ppi version of the file for use in applications that can open only low-resolution Photoshop images.
For non-EPS files, this is a PICT preview.
Macintosh Thumbnail Displays the preview in the Open dialog box.
Windows Thumbnail Saves a preview that Windows systems can display.
Save large documents
Photoshop supports documents up to 300,000 pixels in either dimension and offers three file formats for saving
documents with images having more than 30,000 pixels in either dimension. Keep in mind that most other
applications, including versions of Photoshop earlier than Photoshop CS, cannot handle files larger than 2 GB or
images exceeding 30,000 pixels in either dimension.
❖ Choose File > Save As, and choose one of the following file formats:
Large Document Format (PSB) Supports documents of any file size. All Photoshop features are preserved in PSB files
(though some plug-in filters are unavailable if documents exceed 30,000 pixels in width or height). Currently, PSB files
are supported only by Photoshop CS and later.
Photoshop Raw Supports documents of any pixel dimension or file size, but does not support layers. Large documents
saved in the Photoshop Raw format are flattened.
TIFF Supports files up to 4 GB in size. Documents larger than 4 GB cannot be saved in TIFF format.