Select Palette from the Edit menu if the palette is not displayed.
Click the Selector tool in the palette.
Move the pointer into the View window.
Place the target pointer over a corner of the region you want to save as a new image and drag mouse button 1 to the opposite corner.
Image Viewer draws a border around the region you define.
Choose Save Selection As from the File menu.
The Save Selection As dialog box appears.
Select the file format in which you want your file written.
For a list of the formats, see "Image Viewer File Formats".
(Optional) Choose a compression method from the Compression menu button.
The default is None (no compression); compressed files require less disk space.
(Optional) Choose the number of colors to save for your file from the Colors menu button.
The choices depend on the type of monitor you have.