Save Layers. Select this option to save one or more layers in a new document. Then, click Layers to specify which layers to save. This option isn’t available if the document has only one layer. Use Compression. Check this box to reduce the size of files saved on disk. Preview. Select the “Preview” option to save a low-resolution pre- view of the document. In applications that support previews, you can see a thumbnail image of the document before opening the file. Use Preview Icon (Mac only). Canvas creates a finder icon with a preview of the document if you select this option. Use Extensions (Mac only). Adds a three-character filename exten- sion. Use this if you use Mac files on Windows systems. Reverting to the saved version of a document The Revert command lets you discard changes made to a document since it was last saved. This is the same as closing the document without saving changes, and then opening the original from disk. Be certain that you want to discard all changes to a document before choosing the Revert command, because you cannot use the Undo command to restore your work after using the Revert command. Keep in mind that you can use the Save As command to save a docu- ment with a new name. If you are not certain that you want to discard changes to a document, use Save As to store a new version on disk, then open the original document and compare the two. To revert to a document’s saved version:  Choose File > Revert. Before performing the command, Canvas asks you to con- firm that you want to discard all changes. Closing documents When you close a document, Canvas removes the document window from the screen. Closing a document doesn’t save it (Canvas will warn you if you try to close a document that has changed). To close a Canvas document:  Choose File > Close. You can also click the Close button (Mac) or the Close button (Windows) in the document’s title bar to close the document. Close button (Windows) Close button (Mac OS X)
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